A Valve that permits flow in one direction only. A check valve allows liquid / air to flow in only one direction. The primary purpose of a check valve is to prevent backflow in the system. A pneumatic check valve allows the compressor to keep certain parts pressurized and other parts de-pressurized. They could be located on an air receiver, discharge pipe, or as a piston check valve on the piston compressor’s inlet and outlet sides.
Types of Check valves:
- Spring loaded check valve:
Ball check valve:
Swing check valve:
Bolted bonnet, (B) hinge or trunnion, (C) valve body, (D) disc, (E) seal
Foot valve: a Check valve combined with strainer
