Check Valves – Water
Design: Wafer Check, Swing Check, Tilting Disc and Rubber Flapper Check.
Typical Applications: Water & Sewage.
End Connections: Flanged (AS4087).
Pressure Class Range: ANSI Class 150 to 1500, PN10 / PN16 / PN25 / PN40 / PN64.
Sizes: DN50 — DN1950 (2” to 78”).
Body Materials: Carbon Steel, Stainless Steel, Cast Iron and Ductile Iron.
Seat & Seal Materials: Virgin PTFE, Reinforced PTFE, PFA, Viton, NBR, EPDM and Metal.
Accessories: Lever Arm / Counter Weight and Special Adaptions.
Quality: Pressure Tests - API 598.
Standards: Design, Production and Testing: AS, ASME, ANSI, API 6D, and ASTM. Quality System: EN ISO 9001:2008, EN ISO 14001:2004.
Brands: DeZurik - APCO and Challenger.
Design Details: A check valve or non-return valve is a valve that normally allows fluid (liquid or gas) to flow through it in only one direction, minimising and preventing backflow.
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. There are various types of check valves used in a wide variety of applications. Check valves work automatically and most are not controlled by a person or any external control; accordingly, most do not have any valve handle or stem. An important concept in check valves is the cracking pressure which is the minimum upstream pressure at which the valve will operate. Typically the check valve is designed for and can therefore be specified for a specific cracking pressure.