PNEUMATIC VALVE
A check valve, also called a non-return valve (NRV) or one-way valve, is a self-acting valve designed to stop reverse flow in a pipeline. When fluid flows in the forward direction, the valve opens; when flow tries to reverse, the internal element (disc, ball, poppet, or flap) immediately closes, sealing the passage. A comparison between check valves and quick exhaust valves Specification-style description for a specific size (e.g., 1/4“, 1/2”)