Selection of check valve for reciprocating compressor outlet?
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Should the check valve at the outlet of a reciprocating compressor be a swing type or a lift type? Why? I earnestly ask all fellow sailors for your advice!
Everything I’ve seen uses swing-type valves; the specific reason is unclear. Those who are aware of it please provide more information.
A dedicated reciprocating compressor outlet check valve should be used. Both ordinary swing-type and lifting-type ones perform poorly, especially when dealing with large volumes of material. The type we designed to use was swing-type, with significant backflow; it has been changed now.
Would a lift-type one be better?
These days, gas-valve type check valves are generally used
For the compressor outlet check valve, it is advisable to use a lift-type valve. Because the gas is not continuous but pulsating, the disc of a swing check valve opens and closes frequently, which makes it prone to damage. Find the internal structure diagrams of two types of check valves, and it will be clear at a glance.
We use the lift-type ones; the swing-type ones have frequent power usage which can lead to damage.
Reply to 6# nbazxb: Thank you very much for all your enthusiastic replies. We have chosen a swing check valve.
At present, we use gas valves quite frequently, as they can effectively prevent gas backflow
Reply to 9# wfs0213: Nowadays, gas-valve type check valves are generally used, as they have a low opening pressure and zero backflow.
We use a variety of types nowadays. But the worst type is the \"lifting type,\" because the airflow at the outlet of piston compressors is not very stable, which causes the guide rod of the valve to wear out easily. Over time, the valve rod wears away and the valve stops functioning. “The “rotary” check valve also has this problem: when the air flow is unstable, its pin is prone to wear. When worn to a certain extent, the sealing performance of the valve disc declines. The type that has proven effective for us is the \"valve disc check valve\" (Shanghai Heerbig), and no issues have been found during each inspection.