Value Brand 1-1/4" NPT Stainless Steel Swing Check Valve

1-1/4" NPT Swing Check Valve

This 316 stainless steel swing check valve uses an inline swing mechanism with PTFE seals to prevent backflow in water or steam lines. The FNPT x FNPT connections accept 1-1/4 inch pipe threads for direct inline installation. It is suited for plumbers and maintenance teams who need reliable non-return flow control in industrial or commercial piping systems. The valve operates horizontally and delivers full flow when open.

Replaces worn or missing check valves

The valve handles up to 200 psi water pressure and 200 psi steam pressure with a cracking pressure of .5 psi. It replaces older brass or iron units that have corroded or failed to seal, especially in systems that see temperatures between -4 degrees F and 350 degrees F. The upgrade is worth it when the existing valve leaks, chatters or restricts the 49 gpm full-flow capacity this unit provides.

Install horizontally with pipe thread sealant

Thread the FNPT ends onto matching 1-1/4 inch male pipe threads using appropriate sealant; no special tools are required beyond standard pipe wrenches. The valve must be mounted horizontally so the swing disc can open and close freely under gravity. The most common issue is installing it vertically or upside down, which prevents the disc from seating and allows backflow.