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Cause Analysis and Solution of Internal Leakage of Electric Forged Steel Ball Valve

The electric forged steel ball valve has been widely used in various industrial control systems because of its high control precision and convenient installation and debugging. However, in the process of use, there are also some problems bothering the field installation and commissioning personnel, that is, the valve leakage problem. Here we will discuss the common internal leakage causes and solutions of electric forged steel ball valve, hoping to help the on-site maintenance personnel of the factory.

The zero position setting of electric forged steel ball valve actuator is not accurate, and the valve is not fully closed.

Adjustment method:

  • 1. Close the valve manually (it must be confirmed that it has been completely closed);
  • 2. Then manually close the valve with force, and it shall be subject to the condition that the valve can not be turned slightly with force;
  • 3. Then screw back half a turn (in the direction of opening the valve);
  • 4. Then adjust the limit.

Selection of travel mode for electric forged steel ball valve:

The valve is opened and closed by 90 ° rotation, and the torque force of the actuator is not large enough. When there is no pressure, it is easy to reach the full closing position when there is no pressure. However, when there is a rotating force, it can not overcome the thrust pushed by the liquid, so it can not be closed in place.
Solution: replace the actuator with high thrust force or replace it with balanced valve core to reduce the unbalanced force of medium.

Internal leakage caused by manufacturing quality of electric forged steel ball valve:

In the production process, the valve manufacturer does not control the valve material, processing technology and assembly process strictly, which results in unqualified grinding of sealing surface, failure to eliminate pitting, sand hole and other defects of products, resulting in internal leakage of electric forged steel ball valve.
Solution: rework the sealing surface.

The internal leakage of the valve is affected by the control part of the electric forged steel ball valve.

The traditional control method of electric forged steel ball valve is through valve limit switch, over torque switch and other mechanical control methods. Due to the influence of environmental temperature, pressure and humidity on these control elements, the valve positioning is inaccurate, spring fatigue, thermal expansion coefficient is uneven and other objective factors, resulting in internal leakage of electric forged steel ball valve.
Solution: readjust the limit.

Internal leakage caused by commissioning problems of electric forged steel ball valve:

Affected by the processing and assembly process, the electric forged steel ball valve can not be opened after being closed manually. For example, if the stroke of the electric control valve is adjusted smaller by the action position of the upper and lower limit switch, the electric control valve cannot be closed tightly or the valve cannot be opened; if the stroke of the electric forged steel ball valve is adjusted larger, the over torque switch protection will be caused If the action value of the over torque switch is adjusted larger, the deceleration transmission mechanism or valve will be damaged, and even the motor will be burned out. In order to solve this problem, usually, when the electric control valve is debugged, the electric control valve is manually shaken to the bottom, and then the lower limit switch position of the electric valve is set, and then the electric forged steel ball valve is opened to the full open position and the upper limit switch position is fixed. In this way, the electric forged steel ball valve will not be opened after being closed manually, so that the electric valve can be opened and closed automatically For example, but virtually caused the electric forged steel ball valve internal leakage. Even if the adjustment of the electric control valve is ideal, because the action position of the limit switch is relatively fixed, the constant erosion and wear of the valve control medium in the operation of the valve will also cause the internal leakage caused by the valve closing laxly.
Solution: readjust the limit.

The type selection error of electric forged steel ball valve results in cavitation corrosion of valve and internal leakage of electric control valve.

Cavitation is related to pressure difference. When the actual pressure difference △ P of the valve is greater than the critical pressure difference △ PC, cavitation will occur. During cavitation process, bubbles will release huge energy, which will cause great damage to throttle elements such as valve seat and valve core. General valves can operate for three months or even less under cavitation conditions, that is, valves suffer from serious cavitation corrosion, As a result, the leakage of the valve seat can reach more than 30% of the rated flow, which is irreparable. Therefore, different uses of electric forged steel ball valves have different specific technical requirements. It is very important to select the electric control valve reasonably according to the system process flow.

Internal leakage caused by medium erosion and aging of electric forged steel ball valve:

After a certain period of operation after the adjustment of the electric forged steel ball valve, due to the cavitation and medium erosion of the valve, wear of the valve core and valve seat, aging of the internal parts and other reasons, the stroke of the electric control valve is too large and the electric control valve is not closed tightly, which causes the leakage of the electric control valve to increase. With the passage of time, the internal leakage of the electric forged steel ball valve will become more and more serious Heavy.

Solution: readjust the actuator and carry out regular maintenance and correction.

Source: China Valve Supplier: 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

Summary
cause analysis and solution of internal leakage of electric forged steel ball valve - Cause Analysis and Solution of Internal Leakage of Electric Forged Steel Ball Valve
Article Name
Cause Analysis and Solution of Internal Leakage of Electric Forged Steel Ball Valve
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Here we will discuss the common internal leakage causes and solutions of electric forged steel ball valve, hoping to help the on-site maintenance personnel of the factory.
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www.epowermetals.com
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