With a long service life and maintenance-free period, it will depend on several factors: normal working conditions, maintaining a harmonious temperature/pressure ratio, and reasonable corrosion data.
When the ball valve is closed, there is still a pressurized fluid inside the valve body.
Before repair: relieve line pressure and open the valve; disconnect power or air supply; disconnect actuator from bracket
It must be ascertained that the upper and lower pipes of the ball valve have been relieved of pressure before they can be disassembled and disassembled.
Care must be taken during the disassembly and reassembly to prevent damage to the sealing surfaces of the parts, especially for non-metallic parts. Special tools should be used when removing the O-rings.
The bolts on the flange must be tightened symmetrically, stepwise and evenly during assembly
