In plumbing applications, check valve is often used to prevent the cross-contamination of water due to back pressure or back-siphonage, often caused by drop in pressure on the supply side or by draining the system.
In heating applications, check valve acts as a one-way valve to prevent mixing of the supply and return water, especially in systems with radiant floors and baseboard/panel radiators.
Check Valve is an in-line, one-way valve which purpose is to prevent the backflow of water due to back pressure, gravity flow of thermal siphoning. Lead-free check valves are suited for both potable water plumbing and heating applications. Regular Brass Check Valves can be used for non-potable water applications only. Available in swing and spring-loaded types.