electric regulating valveDue to its advantages of easy installation and high precision, it is widely used. However, occasional malfunctions may occur during use, leaving people helpless. Below, we will talk about common faults and solutions of electric control valves.
The internal leakage phenomenon of electric control valves is one of the common faults of electric control valves. Inaccurate zero position setting of the actuator and failure to reach the fully closed position of the valve can lead to this phenomenon.
Adjustment method:

1) Manually close the valve (it must be confirmed that it has been * closed);

2) Manually close the valve with more force, until it cannot be turned with a little bit of force;

3) Twist back (in the direction of valve opening) by half a circle;

4) Then adjust the limit
The valve of the electric control valve is of the downward push closing type, and the thrust of the actuator is not strong enough. When there is no pressure, it is easy to reach the fully closed position during debugging. However, when there is downward thrust, it cannot overcome the upward thrust of the liquid, so it cannot be closed in place. Solution: Replace the high thrust actuator or use a balanced valve core to reduce the unbalanced force of the medium.
　　electric regulating valveThe control part affects the internal leakage of the valve:
The traditional control method of electric control valves is through mechanical control methods such as valve limit switches and over torque switches. Due to the influence of environmental temperature, pressure, and humidity on these control components, the valve positioning is inaccurate, and objective factors such as spring fatigue and uneven thermal expansion coefficient cause internal leakage of electric control valves.
Solution: Adjust the limit again.
Internal leakage caused by debugging issues with the electric control valve:
Due to the influence of processing and assembly technology, electric control valves generally have the phenomenon of being unable to open after being manually closed tightly. If the stroke of the electric control valve is adjusted smaller by the action position of the upper and lower limit switches, an unexpected state of the electric control valve not closing tightly or the valve not opening can occur; If the stroke of the electric control valve is adjusted larger, it will cause the over torque switch protection action; If the action value of the over torque switch is adjusted to be larger, accidents such as damaging the deceleration transmission mechanism or valves, or even burning out the motor may occur. To solve this problem, usually during the debugging of the electric control valve, manually shake the electric control valve to the bottom, then shake it one circle in the opening direction, set the lower limit switch position of the electric door, and then open the electric control valve to the fully open position and set the upper limit switch position. This way, the electric control valve will not have the phenomenon of being unable to open manually after being tightly closed, allowing the electric door to open and close freely. However, this inadvertently causes internal leakage of the electric door. Even if the electric control valve is adjusted ideally, due to the relatively fixed action position of the limit switch, the continuous flushing and wear of the valve by the medium controlled by the valve during operation can also cause internal leakage caused by the valve not closing tightly.
Solution: Adjust the limit again.
The above are the reasons and solutions for the internal leakage phenomenon of electric control valves. We hope it will be helpful to everyone.

Shanghai Mingjing Anti corrosion Valve Manufacturing Co., Ltd

Technical Department