What is a Check valve?
Check valves, non-return valves or one-way valves are valves that normally permit gases and liquids to flow in only one direction, preventing process flow from reversing. They are classified as one-way directional valves. Fluid flow in the desired direction opens the valve by delta pressure, while backflow forces the valve closed. Check valves are two-port mechanical valves, meaning they have two openings in the body, one for fluid to enter and the other for fluid to exit the valve.
Types of Check valve
Most popular check valve types are: spring loaded check valves, adjustable check valves, ball check valves, spring-loaded poppet check valves, excess flow check valves, vacuum check valves, dual plate, piston, lift check valves and swing check valves. Select the product of your choice below or continue to filter with above product search engine.
How to select Check Valves?
The check valve can be selected by check valve cracking pressure, body and seal material compatibility with the medium, valve rating (ANSI, DIN, bar and psig), flow capacity, maximum setpressure, set pressure range, maximum working pressure, maximum temperature, minimum temperature, line zise and end connection type (flange, nominal pipe thread , tube fitting), check valve design, special requirements for hydrogen check valves, CNG check valves, oxygen check valves, NSF check valves, NACE check valves, NORSOK check valves, LNG check valves, etc.
Learn more about the selection of check valves and installation of check valves: How to select check valves?
Check valve applications
Check valves are used with a variety of media: liquids, air, other gases, steam, condensate, and in some cases, liquids with fines or slurries. NACE compliant check valves in gas and oil applications. Check valve applications include sample systems, pumps, air compressors, compressor stations, header lines, vacuum breakers, steam lines, condensate lines, chemical feed pumps, cooling towers, loading racks, nitrogen purge lines, boilers, HVAC systems, utilities, pressure pumps, sump pumps, wash-down stations, and injection lines.