With the in-depth research on corrosion resistant materials, most overseas applications use corrosion resistant materials to make valve cores, seats and valves to improve the dynamic performance of control valves and make the flow characteristics meet the control requirements.

Elimination method
1. Eliminate impurities and clean the valve cavity
2. Adjust the adjusting screw of the worm gear or electric actuator to ensure the correct closing position of the valve
3. Check the flange plane and the bolt pressing country, which should be evenly pressed
4. Leakage at both ends of pressure valve shall be conducted according to the sealing direction of tip
1. Sealing gaskets on both sides fail
2. The tightening force of pipe flange is uneven or not compacted
3. On the sealing ring