What are the causes of common failures of control valves?

1, the valve opening is insufficient, because the valve is blocked or blocked, the valve is not completely closed when it is closed, but after the trip, the system does not give an alarm and leaks;

2. The seal is damaged, and the regulating valve has been closed, but the gasket is damaged and the seal is lax, resulting in valve leakage;

3. The control valve is damaged. After the voltage is given, the regulating valve does not work normally.