Tightness and strength test:
(1) Strength test, No leakage is observed to prove that the valve body strength is qualified.
(2) Sealing test: nitrogen is generally used as the medium; Close the pneumatic ball valve, and then inject nitrogen into the pneumatic ball valve from the pressure test valve on the sleeve. The pressure rises to 1.1 times of the nominal pressure of the pneumatic ball valve, and the middle chamber pressure relief valve is connected with the hose to the water container for detection. The insertion depth is 1cm; If there is no bubble within 5min, the valve sealing is qualified.

② Valves: valves are the control parts in the fluid transmission system (including ball valves, butterfly valves, stop valves, gate valves, control valves, etc.).