Causes of internal leakage of electric control valve and its treatment

Causes of internal leakage of electric control valve and its treatment

The electric control valve has high control accuracy, especially in flow control, and has obvious advantages in installation structure. It is widely used in industrialized control systems. Otherwise, when we use the electric control valve, there will still be various problems to perplex us. Now we mainly talk about the causes and treatment methods of internal leakage of the electric control valve, From the analysis of the causes and solutions of the problems, it has a good promotion for the maintenance personnel.

When the electric control valve is processed or assembled, it is more affected by the process, which may cause internal leakage of the electric control valve. The main problem is the limit switch, which is mainly due to the fixed action of the limit switch and the continuous scouring and mode of the medium on the valve control on the control valve during operation, It will cause the valve to fail to close, resulting in internal leakage. This problem can be solved by adjusting the position of the limit switch.

There are other problems below:

1.       Improper commissioning of the regulating valve resulted in internal leakage.

2. The electric control valve failed in the control part. This is mainly because the electric control valve is also introduced in the limit switch and over torque switch of the valve. The occurrence of these problems will lead to wear or corrosion of the sealing surface: it is mainly manifested in trachoma, pockmarks and scratches, which is also a problem of internal leakage. The emergence of such problems mainly focuses on adjustment.

3. Due to the inaccurate zero setting of the electric actuator, the valve cannot be fully closed. Main adjustment method: close the valve manually, or close the valve manually. If you can't understand it, turn it back half a turn to adjust the limit.

4. The valve is closed by pushing down. If the thrust of the actuator is not large enough, the valve will not be fully closed, which is also one of the main problems of internal leakage. Solution: replace the actuator with high thrust, or the valve core should be balanced to reduce the unbalanced force of the medium.