(1) Reason: The upper and lower cover screws of the valve body are not tightened; the rubber film in the valve body is damaged; the air inlet sealing ring is aging and damaged.

(2) Treatment method

Tighten the upper and lower cover screws; replace the rubber membrane; the rubber sealing ring at the connection of the gas pressure reducing valve and the cylinder plays a role of sealing and air supply. After long-term use, even if the gas cylinder is replaced, it will wear and age, and it will fall off by itself. A large amount of natural gas is running, causing serious accidents. Therefore, every time the gas cylinder is replaced, when installing the pressure reducing valve, special attention should be paid to check whether the rubber sealing ring is intact, whether it is aging or worn, especially when installing, you must check whether the sealing ring is lost. If it is aging or worn, it should be replaced in time, but it is not feasible to cut with a film, and a special sealing ring must be used.