Common failures are:
① Disc smashed
② the flow of media back.
The cause of the disc breaking is
Check valves before and after the media pressure is close to balance and each other "saw" state, the disc often with the seat flap, some brittle materials (such as cast iron, brass, etc.) disc is broken.
The precautionary approach is to adopt the valve disc as a ductile material check valve.
The reason for the reversal of media is
① sealing surface damage;
② clamp into impurities.
Repairing sealing surfaces and cleaning impurities can prevent backflow.