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Check valve is the flow of air can only flow in one direction and can not reverse the directional control valve. Its working principle and hydraulic check valve the same. Compressed air from the P port to enter, to overcome the spring force and friction to make the one-way valve port open, compressed air flow from P to A; P port without compressed air, the spring force and A port (cavity) residual air force The valve port is closed and the airflow from A to P is blocked. Check valve is not used to allow reverse flow of the occasion, such as the air compressor to inflatable gas tank, air compressor and gas tank set up a check valve, when the air compressor to stop working, to prevent the gas tank The compressed air back to the air compressor. One-way valves are also often combined with throttles, sequence valves, etc. into one-way throttles, one-way sequence valves. More Keyword Search: Check Valve
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