A check valve, non-return valve, reflux valve, retention valve, foot valve, or one-way valve is a valve that normally allows fluid (liquid or gas) to flow through it in only one direction. Check valves are two-port valves, meaning they have two openings in the body, one for fluid to enter and the other for fluid to leave.
Forged construction these Non-return ‘NRV’ Check Valves are a spring loaded, non return valve design for use with heating, sanitary, compressed air systems, pumps and fuel distribution networks.
These Non-return ‘NRV’ Check Valves can be fitted in vertical, horizontal or oblique pipelines to allow the flow to go in one direction. These non return valves with Viton seals have F x F BSP internal threads on both the inlet and outlet.