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What is a diaphragm pump

What is a diaphragm pump?

Table of Contents

Diaphragm pump is to separate the transmitted liquid from the movable column and pump cylinder with the help of membrane, so as to protect the movable column and pump cylinder. The parts on the left side of the diaphragm in contact with the liquid are made of corrosion-resistant materials or coated with a layer of corrosion-resistant substances; The right side of the diaphragm is filled with water or oil.

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Main materials of Diaphragm pump

Diaphragm pump, also known as control pump, is the main type of actuator. It changes the fluid flow with the help of power operation by receiving the control signal output by the regulating control unit. The function of diaphragm pump in the control process is to receive the control signal of regulator or computer, change the flow of regulated medium, and maintain the regulated parameters within the required range, so as to achieve the automation of production process. If the automatic adjustment system is compared with the manual adjustment process, the detection unit is human eyes and the adjustment control unit is human brain, then the execution unit diaphragm pump is human hands and feet. In order to realize the regulation and control of a certain parameter of the process, such as temperature, pressure, flow, liquid level, etc., it is inseparable from the diaphragm pump.
Pneumatic diaphragm pump has five commonly used materials: plastic, aluminum alloy, cast iron, stainless steel and Teflon. Electric diaphragm pump has four kinds of materials: plastic, aluminum alloy, cast iron and stainless steel. According to different liquid media, the diaphragm of diaphragm pump adopts nitrile rubber, neoprene, fluororubber, polytetrafluoroethylene, polytetraethylene, etc. and is arranged on various special occasions to pump various media to meet the needs.

Special material

Neoprene
Neoprene is widely used in non corrosive applications. It has the characteristics of long service life and low cost; Temperature limit: – 17.7 ° C to + 93.3 ° C, 0 ° FTO + 200 ° f
Buna-N (nitrile rubber)
Nitrile rubber is mainly used in petrochemical and oily liquids with good elastic life. Temperature limit: – 12.2 ° C to + 82.2 ° C, + 10 ° FTO + 180 ° f
NORDEL (EPDM) ternary rubber
It has excellent effect in very low temperature. It can also be used as a substitute for acid and alkaline fluids to reduce costs. Temperature limit: – 51.1 ° C to + 137.8 ° C, – 60 ° FTO + 280 ° f
Viton (fluorinated rubber)
Fluorinated rubber is applied to very high temperature, and the effect is very good. It can be used for some acid and alkali products. But the cost is high and the service life is short. Temperature limit: – 40 ° C to + 175.7 ° C, – 40 ° FTO + 350 ° f

Flow characteristics of diaphragm pump

The flow characteristics of diaphragm pump refer to the relationship between the relative flow of medium flowing through the valve and displacement (relative opening of the valve). The ideal flow characteristics mainly include straight line, equal percentage (logarithm), parabola and fast opening. There are only three commonly used ideal flow characteristics: straight line, equal percentage (logarithm) and fast opening.
Consider the following aspects:

  • ① Analyze and select the regulation quality of the regulation system;
  • ② Considering the process piping;
  • ③ From the analysis of load change.

Selection mode of diaphragm pump

Valve body type is the most important link in the selection of diaphragm pump. There are many kinds of diaphragm pump valve bodies.

  • (1) The shape and structure of the valve core are mainly considered according to the selected flow characteristics and unbalanced force.
  • (2) Abrasion resistance: when the fluid medium is a suspension containing high concentration of abrasive particles.
  • (3) Corrosion resistance: as the medium is corrosive, the valve with simple structure shall be selected as far as possible under the condition of meeting the regulation function.
  • (4) Medium temperature and pressure: when the medium temperature and pressure are high and change greatly, the valve with small temperature and pressure change of valve core and valve seat materials shall be selected.

Selection of diaphragm pump

Consideration of output force
No matter what type of actuator is, its output force is effective for overcoming load (mainly refers to unbalanced force and unbalanced torque plus friction, sealing force, gravity and other related forces).

Working principle of diaphragm pump

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Diaphragm pump is a special form of positive displacement pump. It depends on the back and forth agitation of a diaphragm to change the volume of the working chamber, so as to inhale and discharge liquid.

Pneumatic diaphragm pump is mainly composed of transmission part and diaphragm cylinder head. The transmission part is a driving mechanism that drives the diaphragm to drum back and forth. Its transmission forms include mechanical transmission, hydraulic transmission and pneumatic transmission, among which hydraulic transmission is widely used. The working part of diaphragm pump is mainly composed of crank connecting rod mechanism, plunger, hydraulic cylinder, diaphragm, pump body, suction valve and discharge valve. Among them, the driving mechanism composed of crankshaft connecting rod, plunger and hydraulic cylinder is very similar to reciprocating piston pump.
When the diaphragm pump works, the crank connecting rod mechanism, driven by the motor, drives the plunger to move back and forth. The movement of the plunger is transmitted to the diaphragm through the working liquid (generally oil) in the hydraulic cylinder, which makes the diaphragm agitate back and forth.
The cylinder head of the pneumatic diaphragm pump is mainly composed of a diaphragm to separate the transmitted liquid from the working liquid. When the diaphragm moves to one side of the transmission mechanism, the liquid is sucked in under negative pressure when the pump cylinder works, and the liquid is discharged when the diaphragm moves to the other side. The delivered liquid is separated from the working liquid by the diaphragm in the pump cylinder, and only contacts the pump cylinder, suction valve, discharge valve and the inner side of the diaphragm, rather than the plunger and sealing device, which makes the plunger and other important parts work completely in the oil medium and in a good working state.
The diaphragm should have good flexibility and good corrosion resistance. It is usually made of PTFE, rubber and other materials. The pot bottom parts with mesh on both sides of the diaphragm are set to prevent excessive deformation of the diaphragm, which is generally called diaphragm limiter. The pneumatic diaphragm pump has good sealing performance and can easily achieve leak free operation. It can be used to transport corrosive liquids such as acid, alkali and salt and high viscosity liquids.

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Pneumatic schematic diagram of pneumatic diaphragm pump
A diaphragm is installed in each of the two symmetrical working chambers of the pump, which is connected into a whole by a central connecting rod. The compressed air enters the air distribution valve from the air inlet of the pump, and the compressed air is introduced into one chamber through the valve distribution mechanism to promote the movement of the diaphragm in the chamber, while the gas in the other chamber is discharged. Once the end of the stroke is reached, the valve mechanism automatically introduces compressed air into another working chamber to push the diaphragm to move in the opposite direction, so as to make the two diaphragms move back and forth continuously and synchronously. In the figure, the compressed air enters the air distribution valve from to make the diaphragm move to the right, the suction of the chamber makes the medium flow in from the inlet, pushes the ball valve into the chamber, and the ball valve is locked due to suction; The medium in the chamber is squeezed, the ball valve is pushed open and flows out from the outlet. At the same time, the ball valve is locked to prevent flow. In this way, the medium is continuously inhaled from the inlet and discharged from the outlet.

Application of diaphragm pump

As the pneumatic diaphragm pump has the above characteristics, since its birth, the diaphragm pump is gradually invading the market of other pumps and occupying an important part. For example, in the painting and ceramic industry, the diaphragm pump has occupied an absolute leading position.

Internal system of diaphragm pump

Diaphragm pump equipment system consists of one or more bilateral pumps, such as a pneumatic double diaphragm pump. The manifold on the pump is separated to pump out one component of multi-component materials on each side of the pump, and an accumulator is connected with the outputs on both sides to make the out of phase output of the pump into in-phase. Diaphragm isolation valves can be selected at the outlet of each side of the pump to prevent the backflow of mixed materials. If a mixing ratio other than 1:1 is required, more than one such pump can be used together to achieve a variety of mixing ratios.
Diaphragm failure monitoring system is used to detect leakage of diaphragm pump diaphragm. The system includes a pump with a working chamber filled with working fluid; A pumping chamber for pumping materials into and out of the pump; And a diaphragm to isolate the working chamber from the pumping chamber. A first optical fiber is connected with the working chamber to transmit an optical signal through the working fluid. A second optical fiber is connected with the working chamber to receive the optical signal transmitted from the first optical fiber. An electrical signal establishment device establishes the first electrical signal when the optical signal is transmitted from the first optical fiber and passes through the uncontaminated working fluid to the second optical fiber. The electric signal establishment device establishes the second electric signal when the optical signal is transmitted from the first optical fiber and passes through the contaminated working fluid to the second optical fiber. When the second electrical signal is established, the leakage of contaminated material through the diaphragm into the working chamber can be detected.
The installation method of diaphragm in diaphragm pump is carried out on the geometric dimension of diaphragm without affecting the volume change requirements of the pump and making full use of the excellent compressive performance of diaphragm. It does not need to increase any cost and workload, but greatly improves the service life of diaphragm, ensures the normalization of production and improves product production quality, It can be applied to the installation of diaphragm in various diaphragm pumps.

Delivery medium of diaphragm pump

  • 1. Pump peanut butter, pickles, mashed potatoes, small red intestines, jam apple juice, chocolate, etc.
  • 2. Pump paint, gum and pigment.
  • 3. All kinds of adhesives and glues can be pumped.
  • 4. Glaze slurry of various tiles, porcelain, brick and pottery.
  • 5. After the oil well is drilled, pump the sediment and grout.
  • 6. Pump various emulsifiers and fillers.
  • 7. Pump all kinds of sewage.
  • 8. Use the pump to clean the oil tanker and barge to absorb the sewage in the warehouse.
  • 9. Hops and fermentation powder slurry, syrup and molasses.
  • 10. Pump water in mines, tunnels, tunnels, beneficiation and slag.
  • 11. Pump cement grouting, mortar and various rubber grout.
  • 12. Various abrasives, corrosives, oil and mud, cleaning oil dirt and general containers.
  • 13. Various highly toxic, flammable and volatile liquids.
  • 14. Various strong acid, alkali and corrosive liquids.
  • 15. Various high-temperature liquids can withstand up to 150 degrees.
  • 16. As the front stage pressure supply device of various solid-liquid separation equipment.

Precautions for diaphragm pump

Start stop load operation
The diaphragm pump is driven by variable frequency motor. If the startup and shutdown load is too large or too small, the load fluctuates greatly in a short time, and the diaphragm pump operates under low load for a long time, it will have an impact on the frequency converter. In order to avoid the above situations as far as possible, it is strictly stipulated that the startup and shutdown load shall be controlled at about 30%, and it shall be set in the instrument so that the increase and decrease of load can be completed within a period of time, Effectively maintain the frequency converter from the process.
Pressure system operation
The instrument air and lubricating oil pressure of the diaphragm pump are interlocked with the main motor. The oil filling and oil discharge valves of the propulsion fluid are air closed valves, which should always maintain a certain air pressure. The minimum action pressure of the two valves is not less than 0.4MPa, so the instrument air pressure is generally maintained above 0.15Mpa. Even after the pump is stopped, the instrument air is not stopped to avoid insufficient or excessive liquid in the propulsion fluid chamber, The air supplied to the valve is filtered and oil atomized.
During the operation of the diaphragm pump, the lubricating oil pressure shall not be lower than the pressure interlock value (0.15Mpa), and the differential pressure of the lubricating oil outlet filter shall not be too large. The steel ball in the lubricating oil flow endoscope shall be at the upper limit position. When adjusting this flow, the adjustment range shall not be too large, so as to avoid interlocking trip caused by too rapid pressure drop caused by instantaneous flow.
Through the above process improvement and mastering the key points of operation, the diaphragm pump has always had a stable process environment during operation. In the past more than one year, there is only one trip due to electrical reasons, so as to achieve long-term, safe and efficient operation.
Use attention
Pneumatic diaphragm pump is a positive displacement pump driven by compressed air and caused by reciprocating deformation of diaphragm. Its working principle is similar to that of plunger pump.
When using pneumatic diaphragm pump to operate, pay attention to the following points:

  • 1. Ensure that the maximum particle contained in the fluid does not exceed the maximum safe particle diameter standard of the pump.
  • 2. The inlet pressure shall not exceed the maximum allowable pressure of the pump. Compressed air higher than the rated pressure may cause personal injury, property loss and damage to the performance of the pump.
  • 3. Ensure that the pipeline system with pump pressure can bear the maximum output pressure, and ensure the cleanliness and normal working conditions of the driving gas circuit system.
  • 4. Electrostatic spark may cause explosion, resulting in personal casualty accidents and property losses. Use wires with large cross-sectional area as required to properly and reliably ground the grounding screw on the pump.
  • 5. The grounding requirements shall comply with local laws and regulations and some special requirements on site.
  • 6. Fasten the pump and all connecting pipe joints to prevent electrostatic sparks caused by vibration, impact and friction. Use antistatic hose.
  • 7. To periodically check and test the reliability of the grounding system, the grounding resistance is required to be less than 100 ohms.
  • 8. Keep good exhaust and ventilation and keep away from inflammables, explosives and heat sources.

Application advantages of diaphragm pump

Diaphragm pump is a new type of conveying machinery, which can transport all kinds of corrosive liquids, liquids with particles, high viscosity, volatile, flammable and highly toxic liquids. Diaphragm pump has four materials: plastic, aluminum alloy, cast iron and stainless steel.
The diaphragm pump adopts nitrile rubber, neoprene, fluororubber, polytetrafluoroethylene and polytetraethylene according to different liquid media. To meet the needs of different users. It is placed on various special occasions to pump media that cannot be pumped by conventional pumps, and satisfactory results have been achieved.
In the painting and ceramic industry, diaphragm pump has occupied an absolute leading position. The advantages of pneumatic diaphragm pump are as follows:

  • 1. Due to the use of air as power, the flow is automatically adjusted with the change of back pressure (outlet resistance), which is suitable for medium and high viscosity fluids. The working point of centrifugal pump is set based on water. If it is used for fluid with slightly higher viscosity, it needs to be equipped with reducer or frequency converter, which greatly improves the cost, and the same is true for gear pump.
  • 2. Pneumatic pump is reliable and low-cost in flammable and explosive environment, such as the transportation of fuel, gunpowder and explosives, because: first, sparks cannot be generated after grounding; Second, no heat is generated during work, and the machine will not overheat; Third, the fluid will not overheat, because the diaphragm pump has the least stirring to the fluid.
  • 3. In the bad places of the construction site, such as the wastewater discharge of construction sites and industrial mines, due to the large amount of impurities and complex components in the sewage, the pipeline is easy to be blocked, so the load on the electric pump is too high and the motor is vulnerable to heating. The pneumatic diaphragm pump can pass through particles and the flow is adjustable. When the pipeline is blocked, it will automatically stop until it is unobstructed.
  • 4. It can be used to transport fluids with unstable chemical properties, such as photosensitive materials, flocculant, etc. This is because the shear force of the diaphragm pump is low and has little physical impact on the material.
  • 5. In the treatment of hazardous and corrosive materials, the diaphragm pump can completely separate the materials from the outside world.
  • 6. Or ensure that there are no impurities contaminating the raw materials in some tests.

In addition, the diaphragm pump has the advantages of small volume, easy movement, no foundation, small floor area, simple and economical installation. It can be used as a mobile material transfer pump.

Characteristics of diaphragm pump

  • 1. There is no shaft seal, no leakage and spacious flow channel. Therefore, when transporting volatile and corrosive media with particles, high viscosity (up to 10000 centipoise), it will not cause environmental pollution and endanger personal safety.
  • 2. No rotating parts, good passing performance, and the maximum particle diameter allowed to pass is up to 10mm. The liquid has no shear flow and the parts of the pump wear little. It has little damage to the conveyor, and can transport sludge and life bodies, such as small fry.
  • 3. It does not need irrigation and water diversion, has strong self-priming capacity, the suction lift is up to 7m, and does not damage the pump for a long time. In case of overload, the pump will shut down automatically. When the load returns to normal, it can start and run automatically, with self-protection function (electric pump does not have this function).
  • 4. The lift of pneumatic pump is 50m, that of electric pump is 30m, and the maximum outlet pressure can reach 0.6 MPa. The electric pump does not have this function, and the inlet needs to be equipped with a regulating valve for control.
  • 5. The pneumatic pump can work immersed in the medium without power supply, which is safe and reliable [the electric pump has no such performance].
  • 6. Pneumatic pump does not need power supply and is more suitable for medium transportation in flammable and explosive occasions.

Composition and classification of diaphragm pumps

The function of diaphragm pump in process control is to receive the control signal of regulator or computer, change the flow of regulated medium, and maintain the regulated parameters within the required range, so as to achieve the automation of production process. If the automatic adjustment system is compared with the manual adjustment process, the detection unit is human eyes and the adjustment control unit is human brain, then the execution unit diaphragm pump is human hands and feet. In order to realize the regulation and control of a certain parameter of the process, such as temperature, pressure, flow, liquid level, etc., it is inseparable from the diaphragm pump. Therefore, the correct selection of diaphragm pump is of great significance in the automation process.

Composition and classification

Diaphragm pump, also known as control pump, is the main type of actuator. It changes the fluid flow with the help of power operation by receiving the control signal output by the regulating control unit. Diaphragm pump is generally composed of actuator and valve. According to the power used by the actuator, the diaphragm pump can be divided into pneumatic, electric and hydraulic, that is, the pneumatic diaphragm pump with compressed air as the power source, the electric diaphragm pump with electricity as the power source and the hydraulic diaphragm pump with liquid medium (such as oil) pressure as the power.

Type selection

The selection of valve body type of diaphragm pump is the most important link in the selection of diaphragm pump. There are many kinds of diaphragm pump valve bodies.

  • (1) The shape and structure of the valve core are mainly considered according to the selected flow characteristics and unbalanced force.
  • (2) Wear resistance when the fluid medium is a suspension containing high concentrations of abrasive particles.
  • (3) Corrosion resistance because the medium is corrosive, the valve with simple structure shall be selected as far as possible under the condition of meeting the regulation function.
  • (4) Medium temperature and pressure when the medium temperature and pressure are high and change greatly, the valve with small temperature and pressure change of valve core and valve seat materials shall be selected.

Selection of diaphragm pump actuator

Consideration of output force
No matter what type of actuator is, its output force is effective for overcoming load (mainly refers to unbalanced force and unbalanced torque plus friction, sealing force, gravity and other related forces).

Determination of actuator type

Action mode selection
There are four types of combination: positive (gas closing type), positive and negative (gas opening type), anyway (gas opening type) and negative (gas closing type) a) process production safety; b) Characteristics of media; c) Ensure product quality and minimize economic loss.

Selection of characteristics

The flow characteristics of diaphragm pump refer to the relationship between the relative flow of medium flowing through the valve and displacement (relative opening of the valve). The ideal flow characteristics mainly include straight line, equal percentage (logarithm), parabola and fast opening. There are only three commonly used ideal flow characteristics: straight line, equal percentage (logarithm) and fast opening.
Specifically, consider the following aspects:

  • ① Analyze and select the regulation quality of the regulation system;
  • ② Considering the process piping; ③ From the analysis of load change.

Selection of caliber

  • 1) Determination of calculated flow. The existing production capacity, equipment load and medium conditions determine the Qmax and qmin of the calculated flow
  • 2) Determination of pressure difference before and after the valve. Select s (resistance coefficient) according to the selected valve flow characteristics and system characteristics, and then determine the calculated differential pressure.
  • 3) Calculate cv. According to the adjusted medium, select the appropriate calculation formula and chart to obtain Cmax and Cmin
  • 4) Select cv. According to Cmax, select the level C > Cmax and closest to it in the selected product standard series
  • 5) Checking calculation of diaphragm pump opening. Generally, the opening at the maximum calculated flow is ≯ 90%, and the opening at the minimum calculated flow is ≮ 10%.
  • 6) Checking calculation of actual adjustable ratio of diaphragm pump. Generally, the actual adjustable ratio is ≮ 10.
  • 7) Determination of valve seat diameter and nominal diameter. After verifying the suitability, determine according to C.

The selection of diaphragm pump is a very detailed work, which requires not only solid professional theoretical knowledge, but also rich practical experience. Good selection is not only conducive to the adjustment of PID parameters of the control loop, so that the adjusted parameters can get better control effect, but also greatly increase the service life of the diaphragm pump. The selection of diaphragm pump should be adjusted to local conditions, not invariable. It should be summarized and innovated in the process of practice. Especially with the application of mechatronics technology, computer and digital information technology, the structure and function of diaphragm pump become better and more comprehensive, which provides great convenience for the selection of diaphragm pump.

Inflation method of diaphragm pump air chamber

The structure of diaphragm pump air chamber is generally used to separate the water chamber from the air chamber. After filling the air chamber with compressed air, the pulsation of water in the water chamber is absorbed by the compressed air in the air chamber through the rubber diaphragm. The function of the air chamber is to use the compressibility (or elasticity) of the air to absorb the water pulsation of the diaphragm pump and make it stable. The water flow into the system is basically stable. However, to meet the requirements of basically stable water flow, it is required that the air pressure in the air chamber should adapt to the water pressure.
Inflation method of diaphragm pump air chamber: before the diaphragm pump operates, inflate the air chamber first, and its air pressure is greater than the working pressure of the pump. Drive the diaphragm pump and adjust it to the working pressure. At this time, the outlet hose of the pump can be seen shaking violently. Take a needle and hold it at the air nozzle to vent. With the progress of venting, the jitter of the water outlet hose will gradually disappear. After the outlet hose is stable, stop bleeding.

Troubleshooting of diaphragm pump

Troubleshooting guide for diaphragm pump operation when you encounter one or more of the following situations, this information can be used as a guide to help you formulate maintenance measures.
The following are several abnormal operating conditions described in this guide: a) fast cycle / low flow b) no cycle / slow cycle / irregular cycle c) leakage d) noise E) component rupture.
In the process of pump application, these situations may be encountered. Each situation can be divided into a variety of possible causes. This guide lists the causes of faults and gives corresponding correct maintenance measures. The meanings of all specific terms in the guide are listed later.
Air valve – copper or stainless steel valve shell is fixed on the pump center body by four bolts.
Piston – aluminum cylinder is encapsulated in the air valve to control the air flow.
Cavitation – due to the decrease or lack of fluid supply at the pump inlet, the pump discharge is lower than the rated quantity. In fact, the liquid chamber is filled with fluid before discharge.
Static pressure relief head — the vertical distance (in feet) from the pump centerline to the free delivery point — the inlet pressure is measured in pounds, including the specific gravity and flow rate of the fluid.
Specific gravity — the ratio of flow to water weight at 68F. The specific gravity of 68F water is 1.0
Static suction head – the vertical distance from the supply liquid level to the center line of the pump, and the pump shall be above the liquid level.
Vapor pressure — the pressure produced by the vapor of all liquids on their free surface. In any pump operating system, the operating pressure shall not be lower than the steam pressure, otherwise the steam formed will partially or completely cut off the fluid into the pump. Viscosity – due to the existence of internal friction of the fluid, the property of viscosity makes the fluid produce flow resistance.
Water hammer action – water hammer is a water hammer that produces water flow shock wave due to the inertia of pressure water flow when the power is suddenly cut off or the valve is closed too fast, just like a hammer, so it is called water hammer. The back and forth force of water shock wave can sometimes be very large, thus damaging the valve and water pump. “Water hammer effect” means that inside the water pipe, the inner wall of the pipe is smooth and the water flows freely. When the open valve is suddenly closed, the water flow will produce a pressure on the valve and pipe wall, mainly the valve. Due to the smooth pipe wall, the subsequent water flow quickly reaches the maximum under the action of inertia and produces destructive effect, which is the “water hammer effect” in hydraulics, that is, positive water hammer. This factor should be considered in the construction of water conservancy pipelines. On the contrary, after the closed valve is suddenly opened, it will also produce a water hammer, called negative water hammer, which also has a certain destructive force, but it is not as big as the former.
Causes and treatment methods of common faults of diaphragm pump:
1. Fault causes and treatment of insufficient flow of diaphragm pump

  • a. Leakage of feed and discharge valve; Repair or replace the feed valve.
  • b. Diaphragm damage; Replace the diaphragm.
  • c. Too slow speed and regulation failure; Maintain the control device and adjust the speed.

2. Causes and treatment of insufficient or elevated pressure of diaphragm pump

  • a. Improper adjustment of pressure regulating valve of pneumatic diaphragm pump; Adjust the pressure valve to the required pressure;
  • b. Failure of pressure regulating valve; Maintenance of pressure regulator;
  • c. Pressure gauge; Repair or replace the pressure gauge.

3. Causes and treatment of pressure drop of diaphragm pump

  • a. Insufficient oil make-up of oil make-up valve; Repair the oil valve;
  • b. Insufficient feed or leakage of feed valve; Maintain the feeding condition and feeding valve;
  • c. Oil leakage of plunger seal; Repair the sealing part;
  • d. The oil level of the oil storage tank is too low; Fill with new oil;
  • e. Leakage of pump body or damage of diaphragm; Check and replace the gasket or diaphragm.

4. Causes and treatment of oil leakage of diaphragm pump
The sealing gasket and sealing ring are damaged or too loose; Adjust or replace the sealing gasket and sealing ring.

Common faults of diaphragm pump

The diaphragm pump shall have no abnormal sound during operation, and all parts shall have no running, emitting, dripping and leakage. The pressure gauge and control valve shall work reliably, and all performance indexes shall meet the rated capacity of the manual or meet the production requirements. However, due to normal wear or aging of parts and materials, faults will also occur.
Causes and treatment of insufficient or elevated pressure of diaphragm pump:

  • 1. Improper adjustment of pressure regulating valve of pneumatic diaphragm pump; Adjust the pressure valve to the required pressure.
  • 2. Failure of pressure regulating valve; Overhaul the pressure regulator.
  • 3. Pressure gauge; Repair or replace the pressure gauge.

Causes and treatment methods of pressure drop of diaphragm pump:

  • 1. Insufficient oil make-up of oil make-up valve; Repair the oil valve.
  • 2. Insufficient feed or leakage of feed valve; Maintain the feeding condition and feeding valve.
  • 3. Oil leakage of plunger seal; Repair the sealing part.
  • 4. The oil level of the oil storage tank is too low; Fill with new oil.
  • 5. Leakage of pump body or damage of diaphragm; Check and replace the gasket or diaphragm.

Failure causes and treatment methods of insufficient flow of diaphragm pump:

  • 1. Feed and discharge valve; Repair or replace the feed valve.
  • 2. Diaphragm damage; Replace the diaphragm.
  • 3. Too slow speed and regulation failure; Maintain the control device and adjust the speed.

Causes and treatment of oil leakage of diaphragm pump: the sealing gasket and sealing ring are damaged or too loose; Adjust or replace the sealing gasket and sealing ring. The pneumatic diaphragm pump operates, but the flow is small or there is no liquid outflow at all:

  • 1. Check the cavitation of the pneumatic diaphragm pump, reduce the speed of the pump and let the liquid enter the liquid chamber.
  • 2. Check whether the valve ball is stuck. If the operating liquid is incompatible with the elastomer of the pump, the elasticity will expand. Please replace the elastomer with appropriate material.
  • 3. Check whether the joint at the pump inlet is completely locked without leakage, especially the clamp near the valve ball at the inlet end needs to be locked.

The air valve of pneumatic diaphragm pump freezes: check whether the water content of compressed air is too high, and install air drying equipment.
There are bubbles at the outlet of the pneumatic diaphragm pump of the pump: check whether the diaphragm is broken and whether the clamp is locked, especially the clamp of the inlet pipe.
The product flows out from the air outlet: check whether the diaphragm is broken and whether the diaphragm and internal and external clamping plates are clamped on the shaft.
The valve rattles: increase the outlet or inlet lift.
Disassembly and reassembly guide for pneumatic diaphragm pump:
Warning: before repairing the pump, remove the air source piping from the pump and discharge the air pressure in the pump. Remove all pipelines connecting the inlet and outlet of the pump, and then discharge the fluid in the pump into a suitable container. Wear protective helmets, glasses and gloves.
Pump does not operate or operates slowly:

  • 1. Check whether there are impurities in the filter screen or air filter device at the air inlet end.
  • 2. Check whether the air valve is stuck and clean the air valve with cleaning solution.
  • 3. Check whether the air valve is worn and replace it with new parts if necessary.
  • 4. Check the condition of the sealing parts of the center body. If it is seriously worn, the sealing effect cannot be achieved, and the air will be discharged from the air outlet end. Due to its special structure, please use only glyd circles.
  • 5. Check whether the piston in the air valve moves normally.
  • 6. Check the type of lubricating oil. If the added lubricating oil is higher than the viscosity of the recommended oil, the piston may get stuck or operate abnormally. It is recommended to use light and antifreeze lubricating oil.

Common types of diaphragm pumps

Pneumatic diaphragm pump

Pneumatic diaphragm pump is a new type of conveying machinery, which uses compressed air as the power source and uses the diaphragm in the cylinder to work back and forth to achieve the purpose of conveying various media.
Media that can be transported: pneumatic diaphragm pump is suitable for transporting all kinds of corrosive and granular liquids, as well as high immunity, volatile, flammable and highly toxic liquids.

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Working principle and characteristics of pneumatic diaphragm pump

Pneumatic diaphragm pump is a positive displacement pump driven by compressed air and caused by reciprocating deformation of diaphragm. Its working principle is similar to that of plunger pump. Due to the characteristics of working principle of pneumatic diaphragm pump, pneumatic diaphragm pump has the following characteristics:

  • (1) The pump will not overheat: the compressed air is used as power, and the exhaust is an expansion and heat absorption process. When the pneumatic pump works, the temperature is reduced and no harmful gas is discharged.
  • (2) No electric spark: the pneumatic diaphragm pump does not use electricity as power, and electrostatic spark is prevented after grounding.
  • (3) It can pass the liquid containing particles: it is not easy to be blocked because of the positive displacement work and the inlet is a ball valve.
  • (4) The shear force on materials is very low: how to suck in and spit out during work, so the stirring of materials is the smallest, which is suitable for the transportation of unstable substances.
  • (5) The flow is adjustable. A throttle valve can be installed at the material outlet to adjust the flow.
  • (6) It has the function of self-priming.
  • (7) It can run empty without danger.
  • (8) You can dive.
  • (9) It can transport a wide range of fluids, from low viscosity to high viscosity, from corrosive to viscous.
  • (10) No complex control system, no cables, fuses, etc.
  • (11) Small size, light weight, easy to move.
  • (12) No lubrication is required, so it is easy to maintain and will not pollute the working environment due to dripping and leakage.
  • (13) The pump can always maintain high efficiency and will not be reduced due to wear.
  • (14) 100% energy utilization. When the outlet is closed, the pump will stop automatically, and there is no equipment movement, wear, overload and heating.
  • (15) No dynamic seal, easy maintenance, avoiding leakage and no dead center during operation.

Selection of materials

1. The shell is made of aluminum alloy, cast iron and stainless steel.
2. The materials selected for the diaphragm are: nitrile rubber, neoprene, fluororubber and polytetrafluoroethylene.
Working principle of pneumatic diaphragm pump:
In the two symmetrical working chambers of the pump, an elastic diaphragm is installed respectively, and the connecting rod connects the two diaphragms into one. After compressed air enters the air distribution valve from the air inlet joint of the pump, the diaphragm in the two working chambers is pushed to move, driving the two diaphragms connected by the connecting rod to move synchronously. At the same time, the gas in the other working chamber is discharged out of the pump from the back of its diaphragm. Once it reaches the end of the stroke, the valve distribution mechanism automatically introduces the compressed air into the other working chamber to push the diaphragm to move in the opposite direction, thus forming the synchronous reciprocating movement of the two diaphragms. Each working chamber is also provided with two one-way ball valves. The reciprocating motion of the diaphragm changes the volume of the working chamber, forcing the two one-way ball valves to open and close alternately, so as to continuously suck and discharge the liquid.
Purpose of pneumatic diaphragm pump:

  • 1. It can suck all kinds of sewage.
  • 2. It can suck all kinds of chemical corrosives, oil, mud and clean oil dirt.
  • 3. It can suck all kinds of highly toxic, flammable and volatile liquids.
  • 4. It can suck all kinds of strong acid, strong alkali and strong corrosive liquids.
  • 5. It can pump all kinds of high-temperature liquids, and the maximum temperature can withstand 150 ℃.
  • 6. It can be used as the front pressure equipment of various solid-liquid separation equipment.

Characteristics of pneumatic diaphragm pump

  • 1. There is no need for irrigation and water diversion. The suction lift is up to 7m, the lift is up to 50m, and the outlet pressure is 6kgf / CMZ.
  • 2. The flow performance is good, and the maximum particle diameter allowed to pass through is up to 10mm. When pumping mud and impurities, there is little wear on the pump.
  • 3. The head and flow can be adjusted steplessly through the opening of the air valve (the air pressure is adjusted between l-7kgf / CMZ).
  • 4. The pump has no rotating parts and no shaft seal. By the reciprocating motion of a pair of diaphragms, various media are pumped. Because the moving parts of the pump are completely separated from the working media, the transmitted media will not leak outward, avoiding environmental pollution and personal harm.
  • 5. It can be used in flammable and explosive places without power supply, which is safe and reliable.
  • 6. It can be immersed in the medium to pump liquid instead of submersible pump.
  • 7. When starting and stopping the pump, only open and close the gas valve. Even if there is no medium pumping for a long time or sudden shutdown due to accidents, the pump will not be damaged. In case of overload, the pump will stop automatically and have self-protection ability. When the load returns to normal, it can start operation automatically.
  • 8. Simple structure and few vulnerable parts. The diaphragm pump has the advantages of simple structure, convenient installation and maintenance. The pump will not contact the moving parts such as valve and connecting rod when conveying medium, so as to avoid corrosion and wear of parts.
  • 9. It can transport more open liquid.
  • 10. No oil lubrication is used, even if it idles, it will have no impact on the pump.

Applicable industry of pneumatic diaphragm pump

  • Chemical industry: acid, alkali, solvent, suspended solids, dispersion system.
  • Petrochemical Industry: heavy oil, grease, mud, sludge, etc.
  • Coating industry: resin, solvent, colorant, paint, etc.
  • Daily chemical industry: detergent, shampoo, emulsion, emulsion, hand cream, surface activator.
  • Ceramic industry: slurry, porcelain slurry, lime slurry and clay slurry.
  • Mining industry: coal slurry, magma, slurry, mortar, lubricating oil, etc.
  • Water treatment: lime slurry, soft sediment, sewage, chemicals and wastewater.
  • Food industry: liquid semi-solid, chocolate, salt water, vinegar, syrup, vegetable oil, soybean oil, honey.
  • Beverage industry: yeast, syrup, concentrate, gas-liquid mixture, wine, fruit juice, corn syrup, etc.
  • Pharmaceutical industry: solvent, acid, alkali, plant extract, ointment and other pharmaceutical materials.
  • Paper industry: binder, resin, paint, ink, pigment, hydrogen peroxide, etc.
  • Electronics: solvent, electroplating solution, cleaning solution, nitric acid, waste acid, corrosive acid, polishing solution.
  • Textile industry: dye chemicals, resins, adhesives, etc.
  • Construction industry: cement slurry, ceramic tile binder, rock slurry, ceiling finish, etc.
  • Automotive Industry: polishing emulsion, oil, coolant, automotive primer, oil emulsion, varnish, varnish additives, degreasing fluid, paint, etc.
  • Furniture industry: binder, varnish, dispersion system, solvent, colorant, white wood glue, epoxy resin, starch binder.
  • Metallurgy, casting and dyeing industry: metal pulp, hydroxide and carbonized pulp, dust washing pulp, etc.

Application example of pneumatic diaphragm pump

  • 1. Pump peanut butter, pickles, mashed potatoes, small red intestines, jam, applesauce, chocolate, etc.
  • 2. Pump paint, gum and pigment.
  • 3. All kinds of adhesives and glues can be pumped.
  • 4. Glaze slurry of various tiles, porcelain, brick and pottery.
  • 5. After the oil well is drilled, pump the sediment and grout.
  • 6. Pump various emulsions and fillers.
  • 7. Pump all kinds of sewage.
  • 8. Use the pump to clean the oil tanker and barge to absorb the sewage in the warehouse.
  • 9. Hops and fermentation powder slurry, syrup and molasses.
  • 10. Pump water in mines, tunnels, tunnels, beneficiation and slag. Pump cement grouting and mortar.
  • 11. Various rubber pastes.
  • 12. Various abrasives, corrosives, oil and mud, cleaning oil dirt and general containers.
  • 13. Various highly toxic, flammable and volatile liquids.
  • 14. Various strong acid, alkali and corrosive liquids.
  • 15. Various high temperature liquids can withstand 150 ℃ at most.
  • 16. As the front stage pressure supply device of various solid-liquid separation equipment.

Application characteristics of pneumatic diaphragm pump

Common characteristics

  • 1. Due to the use of air as power, the flow is automatically adjusted with the change of back pressure (outlet resistance), which is suitable for medium and high viscosity fluids. The working point of centrifugal pump is set based on water. If it is used for fluid with slightly higher viscosity, it needs to be equipped with reducer or frequency converter, which greatly improves the cost, and the same is true for gear pump.
  • 2. Pneumatic diaphragm pump is reliable and low cost in flammable and explosive environment. Third, the fluid will not overheat because the diaphragm pump has the least stirring to the fluid.
  • 3. In the bad places of the construction site, such as the wastewater discharge of construction sites and industrial mines, due to the large amount of impurities and complex components in the sewage, the pipeline is easy to be blocked, so the load on the electric pump is too high and the motor is vulnerable to heating. The pneumatic diaphragm pump can pass through particles and the flow is adjustable. When the pipeline is blocked, it will automatically stop until it is unobstructed.
  • 4. In addition, the pneumatic diaphragm pump has the advantages of small volume, easy movement, no foundation, small floor area, simple and economical installation. It can be used as a mobile material transfer pump.
  • 5. In the treatment of hazardous and corrosive materials, the diaphragm pump can completely separate the materials from the outside world.
  • 6. Pneumatic diaphragm pump can be used to transport fluid with unstable chemical properties.

Pneumatic diaphragm pump plays a huge role in the industrial field. Many things that are difficult to be completed manually can be completed by pneumatic diaphragm pump, which indirectly ensures the work safety of employees.

Use advantages

Pneumatic one-way diaphragm pump has six advantages: reliable quality, long service life, low noise, small vibration, never crash and fine workmanship. It can not only pump flowing liquid, but also transport some non flowing media. It has many advantages of conveying machinery such as self-priming pump, submersible pump, shield pump, mud pump and miscellaneous pump.

  • 1. The flow is spacious and the passing performance is good. The maximum particle diameter allowed to pass is up to 10mm. Little wear to the pump when pumping mud and impurities;
  • 2. The pneumatic one-way diaphragm pump does not need water filling, with a suction lift of 8.8m, a lift of 84m and an outlet pressure ≥ 8.4bar;
  • 3. The pneumatic one-way diaphragm pump has no rotating parts and no shaft seal. The medium pumped by the diaphragm is completely separated from the moving parts and workpiece medium of the pump, and the transmitted medium will not leak outward. Therefore, when pumping toxic, volatile or corrosive media, it will not cause environmental pollution and endanger personal safety;
  • 4. The head and flow can be adjusted steplessly through the opening of the air valve (the air pressure is adjusted between 1-8.4bar);
  • 5. It can work submerged in medium;
  • 6. No need to use electricity, safe and reliable in flammable and explosive places;
  • 7. The pneumatic diaphragm pump has simple structure, few vulnerable parts, simple structure and convenient installation and maintenance. The medium delivered by the pump will not contact the moving parts such as valve and connecting rod. Unlike other types of pumps, the performance will gradually decline due to the wear of rotor, piston, gear, blade and other parts;
  • 8. The utility model has the advantages of convenient use, reliable operation and simple opening and closing of the gas valve. Even if the pump runs without medium for a long time or stops suddenly due to accidents, the pump will not be damaged. Once it is overloaded, the pump will stop automatically with self-protection performance. When the load returns to normal, it can start and operate automatically;
  • 9. Pneumatic diaphragm pump does not need oil lubrication, even if idling, it has no impact on the pump, which is a major feature of the pump;
  • 10. It can transport viscous liquid (viscosity below 25000 centipoise).

Special industries

Electronic pneumatic double diaphragm pump is a complete set of all plastic pneumatic double diaphragm pump developed especially for high-tech electronic industry and strong corrosive media. Its materials include PTFE, conductive PTFE, PE, conductive PE and SS316L. It is very suitable for pneumatic double diaphragm pumps used in the working environment of high pollution, high risk, strong acid, low noise and dust-free room, especially in high-tech industries such as printed circuit board (PCB), semiconductor industry, packaging industry, ultra corrosive transportation and photoelectric industry.
Since the 1990s, with the rapid development of China’s chemical industry and domestic market, enterprises and manufacturers have more stringent requirements for the transportation of corrosive media. The leakage of toxic and corrosive media greatly affects the safety of operators and environmental pollution. Electronic pneumatic diaphragm pump can effectively prevent and solve such problems.
This product has barrier chamber system and diaphragm detector. When the diaphragm is damaged, a signal is generated and transmitted to the controller, and then the controller sends a command to shut down or alarm.

  • (1) The barrier chamber system has two layers of diaphragms and two controllers. Ultrapure liquid is filled between the diaphragms. When the inner membrane in contact with the medium is damaged, the conductivity of the pumped medium and ultrapure liquid is changed after mixing, and the signal is transmitted to the controller by the sensor. When the outer film is damaged, the signal is also transmitted to another controller through the sensor. This can prevent serious consequences caused by diaphragm damage and medium leakage.
  • (2) The diaphragm detector is to install the sensor in the silencer. When the diaphragm on either side is damaged, the medium flows into the silencer. At this time, the sensor can transmit the sensed signal to the controller for relevant control.
  • Generally speaking, when transporting special or high-purity media, reduce unnecessary pollution and waste caused by media leakage as much as possible. If necessary, the above two functions of electronic pneumatic diaphragm pump can be used to ensure operator safety, environment and media pollution. Therefore, this kind of pneumatic diaphragm pump can be widely used in the transportation of special chemical media. Provide a more convenient, safe and efficient solution for enterprises. I firmly believe that in the next few years, the application field of electronic pneumatic diaphragm pump in China will continue to expand. If you encounter this problem, this product provides excellent solutions for customers.

Common faults of pneumatic diaphragm pump

Online maintenance

The diaphragm pump shall have no abnormal sound during operation, and all parts shall have no running, emitting, dripping and leakage. The pressure gauge and control valve shall work reliably, and all performance indexes shall meet the rated capacity of the manual or meet the production requirements. However, due to normal wear or aging of parts and materials, faults will also occur.
Causes and treatment of insufficient or elevated pressure of diaphragm pump:

  • 1. Improper adjustment of pressure regulating valve of pneumatic diaphragm pump; Adjust the pressure valve to the required pressure;
  • 2. Failure of pressure regulating valve; Maintenance of pressure regulator 3 pressure gauge; Repair or replace the pressure gauge.

Causes and treatment methods of pressure drop of diaphragm pump:

  • 1. Insufficient oil make-up of oil make-up valve; Repair oil valve
  • 2. Insufficient feed or leakage of feed valve; Overhaul the feeding condition and feeding valve
  • 3. Oil leakage of plunger seal; Maintenance sealing part
  • 4. The oil level of the oil storage tank is too low; Fill with new oil
  • 5. Leakage of pump body or damage of diaphragm; Check and replace the gasket or diaphragm.

Failure causes and treatment methods of insufficient flow of diaphragm pump:

  • 1. Feed and discharge valve; Repair or replace the feed valve
  • 2. Diaphragm damage; Replace the diaphragm
  • 3. Too slow speed and regulation failure; Maintain the control device and adjust the speed.

Causes and treatment of oil leakage of diaphragm pump: the sealing gasket and sealing ring are damaged or too loose; Adjust or replace the sealing gasket and sealing ring.
The pneumatic diaphragm pump operates, but the flow is small or there is no liquid outflow at all:

  • 1. Check the cavitation of the pneumatic diaphragm pump, reduce the speed of the pump and let the liquid enter the liquid chamber.
  • 2. Check whether the valve ball is stuck. If the operating liquid is incompatible with the elastomer of the pump, the elasticity will expand. Please replace the elastomer with appropriate material.
  • 3. Check whether the joint at the pump inlet is completely locked without leakage, especially the clamp near the valve ball at the inlet end needs to be locked.

Freezing of air valve of pneumatic diaphragm pump: check whether the water content of compressed air is too high, and install air drying equipment
There are bubbles at the outlet of the pneumatic diaphragm pump of the pump: check whether the diaphragm is broken and whether the clamp is locked, especially the clamp of the inlet pipe.
The product flows out from the air outlet: check whether the diaphragm is broken and whether the diaphragm and inner and outer clamping plates are clamped on the shaft
The valve rattles: increase the outlet or inlet lift.
Disassembly and reassembly guide for pneumatic diaphragm pump:
Warning: before repairing the pump, remove the air source piping from the pump and discharge the air pressure in the pump. Remove all pipelines connecting the inlet and outlet of the pump, and then discharge the fluid in the pump into a suitable container. Wear protective helmet, glasses and gloves
Pump does not operate or operates slowly:
1. Check whether there are impurities in the filter screen or air filter device at the air inlet end.
2. Check whether the air valve is stuck and clean the air valve with cleaning solution.
3. Check whether the air valve is worn and replace it with new parts if necessary.
4. Check the condition of the sealing parts of the center body. If it is seriously worn, the sealing effect cannot be achieved, and the air will be discharged from the air outlet end. Due to its special structure, please use only glyd circles.
5. Check whether the piston in the air valve moves normally.
6. Check the type of lubricating oil. If the added lubricating oil is higher than the viscosity of the recommended oil, the piston may get stuck or operate abnormally. It is recommended to use light and antifreeze lubricating oil.

  • 1) Pneumatic diaphragm pump is powered by compressed air. Proper lubrication can make the operation of the pump more stable and prolong the service life of the pump.
  • 2) Ensure that the compressed air is clean. Dirty gas is easy to wear the air valve. It is recommended to install pneumatic triplet!
  • 3) Switch on and off the machine slowly to reduce the impact on the pipeline and diaphragm. Check whether the pipeline connection is loose before startup.
  • 4) When transporting dangerous liquid, please connect the exhaust of the pump to a safe place to avoid danger when the diaphragm is damaged.
  • 5) Please clean it in time after transporting the liquid that is easy to dry, so as not to damage the diaphragm or fail to start the next time.
  • 6) When the pipeline is long, the pipeline shall be fixed, and the pump shall not be used to bear the weight and vibration of the pipeline.

Hidden danger troubleshooting

The pump is running but the flow is too low

  • 1. Check whether there are cavitation spots on the pump body and adjust the inlet pressure of compressed air. Reduce the running speed of the pump body to adjust the liquid with high viscosity and concentration.
  • 2. Check whether the valve ball is stuck. If the delivered liquid does not match the valve ball material. The valve ball will swell. Please replace the ball and valve seat of appropriate material.
  • 3. Please check whether the inlet pipe is blocked.

The pneumatic diaphragm pump cannot be started or moves slowly

  • 1. Check whether the filter, pressure regulating and lubricating device and air inlet filter screen are blocked.
  • 2. Check whether the air valve is stuck by impurities. Please remove and clean the air valve and check whether the piston in the air valve is scratched. If the piston surface is bright but not black, it indicates that it has been worn and the piston and “O” ring need to be replaced. Traces of injuries. Please replace it with a new one
  • 3. Check whether the main shaft and “O” ring are scratched, worn and flattened. If they are damaged, replace them.

Liquid leaks from the outlet of the air chamber

  • 1. Please check whether the diaphragm is broken.
  • 2. Check that the diaphragm is properly installed and locked.

The outlet liquid contains a large number of bubbles

  • 1. Please check whether the diaphragm is broken.
  • 2. Check the pump body and pipeline for leakage.

Regular maintenance

After a long period of operation, the pump will be unable to absorb water. At this time, it is necessary to maintain the pump running for a long time for 24h, especially the highly corrosive waste water residue in industrial wastewater.

  • 1. Prepare maintenance package; Usually, the manufacturer of the air pump has a maintenance package, in which the sealing gasket and silencer are commonly used.
  • 2. According to the actual use, regularly maintain the air pump and clean up some waste residue to ensure the tightness.
  • 3. There is a filter at the suction of each pneumatic pump, which shall be cleaned regularly.

Precautions for use of pneumatic diaphragm pump

Pneumatic diaphragm pump is a positive displacement pump driven by compressed air and caused by reciprocating deformation of diaphragm. Its working principle is similar to that of plunger pump. The pneumatic diaphragm pump is used according to certain principles and methods. In the specific operation procedures, it is used according to certain instructions and precautions, which can play an important role and contribution and play a good value. When using pneumatic diaphragm pump to operate, pay attention to the following points: ensure that the maximum particles contained in the fluid do not exceed the maximum safe particle diameter standard of the pump. Fasten the pump and all connecting pipe joints to prevent static sparks caused by vibration, impact and friction of the split pump. Use antistatic hose. To periodically check and test the reliability of the grounding system, the grounding resistance is required to be less than 100 ohms. Keep good exhaust and ventilation and keep away from inflammables, explosives and heat sources. The inlet pressure shall not exceed the maximum allowable service pressure of the pump. Compressed air higher than the rated pressure of the pipeline pump may cause personal injury, property loss and damage to the performance of the pump.
Electrostatic spark may cause explosion, resulting in personal casualty accidents and property losses. Use wires with large cross-sectional area as required to properly and reliably ground the grounding screw on the pump. The grounding requirements shall comply with local laws and regulations and some special requirements on site. The exhaust of the pump may contain solids. Do not face the exhaust port to the working area or people to avoid personal injury. When the diaphragm fails, the material delivered by the sewage pump will be ejected from the exhaust muffler. Ensure that the pipeline system with pump pressure can bear the maximum output pressure, and ensure the cleanliness and normal working conditions of the multi-stage pump driven gas circuit system. When transporting flammable and toxic fluids, please connect the discharge port to a safe place away from the work area. Connect the exhaust port to the muffler with a pipe with a smooth inner wall of at least 3 / 8 “inner diameter.
The high pressure of fluid may cause serious personal injury and property loss. Please do not carry out any maintenance work on the pump and material pipe system when the pump is pressurized. If the rotor pump needs maintenance, first cut off the air inlet of the pump, open the bypass pressure relief mechanism to relieve the pressure of the pipeline system, and slowly loosen the connected pipe joints. Please do not send the pump directly to the manufacturer for repair, such as harmful and toxic fluid pump and fire pump. For the pump with aluminum alloy material used in the liquid delivery part, please do not use it to deliver the liquid containing Fe3 + and halogenated hydrocarbon and other halogenated hydrocarbon solvents, which will cause corrosion and burst of the pump body. Ensure that all parts contacting the conveying body will not be corroded and damaged by the conveying fluid. Ensure that all operators are familiar with the operation and use and master the precautions for safe use of the pump, and provide necessary protective articles if necessary. The pump shall be used correctly, and long-term idling is not allowed.

Source: Network Arrangement – China Pipe Fitting Manufacturer – Yaang Pipe Industry (www.epowermetals.com)

(Yaang Pipe Industry is a leading manufacturer and supplier of nickel alloy and stainless steel products, including Super Duplex Stainless Steel Flanges, Stainless Steel Flanges, Stainless Steel Pipe Fittings, Stainless Steel Pipe. Yaang products are widely used in Shipbuilding, Nuclear power, Marine engineering, Petroleum, Chemical, Mining, Sewage treatment, Natural gas and Pressure vessels and other industries.)

If you want to have more information about the article or you want to share your opinion with us, contact us at sales@epowermetals.com

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