1. The inner wall of the valve

2. Valve seat

3. Spool

4. Diaphragm
"O" rings and other seals. Check whether the diaphragm and "O"-shaped gasket in the control valve are aging or cracked.
5. Seal packing

The regulating valve, also known as the control valve, is the main type of actuator. By receiving the control signal output by the regulating control unit, the fluid flow is changed by means of power operation. Regulating valves generally consist of an actuator and a valve. According to the power used by its matching actuator, the regulating valve can be divided into three types: pneumatic, electric and hydraulic, that is, the pneumatic regulating valve with compressed air as the power source, the electric regulating valve with electricity as the power source, and the liquid medium. (such as oil, etc.) Pressure-powered electro-hydraulic control valves. In addition, according to their functions and characteristics, there are solenoid valves, electronic, intelligent, and field bus-type control valves.