At what pressure can a check valve provide effective backflow prevention?
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Experts: In existing devices, check valves generally do not function well. Some people say that check valves can prevent backflow at low pressures. May I ask: At what pressure can a check valve provide effective backflow prevention?
Is it a weight-type or swing-type design? Generally, both the weight and the swing plate have a certain amount of weight; the swing-type design requires a certain pressure difference
Check valves are all tested for one-way sealing; the pressure indicated is the maximum pressure up to which flow can occur in the reverse direction