2. As a result, dirt accumulates in the valve and cannot be closed tightly, causing serious oil leakage and channeling; The valve is not closed after maintenance, or the branch pipe is not plugged after valve disassembly; Raw materials that are not resistant to acid and alkali and pressure tests are used for the valve dust seal gasket. Therefore, it is necessary to improve the inspection of valves and strive to ensure prevention in the future.

The number of turns of the output shaft of the valve electric device The number of turns of the output shaft of the valve electric device is related to the nominal diameter of the valve, the screw pitch of the valve stem, and the number of thread heads, which should be calculated according to M=H/ZS (M is the total number of turns that the electric device should meet, H is the opening height of the valve, S is the screw pitch of the valve stem drive thread, and Z is the number of thread heads of the valve stem).