What is the function of a spring in a check valve

Description. TC Series true union ball check valves are offered in PVC, CPVC, and PP. O-rings and seats are FPM or EPDM. 1/4 in. and 3/8 in. sizes are PVC only ... DeZURIK offers many types of check valves to handle different applications and decades of experience in proper application. 244AB LF Brass EzPress Swing Check Valve. Horizontal “T” Pattern. Low Lead Brass Disc. AB1953, NSF/ANSI 61 & 372 Spec Sheet. Check Valve (9) · Sprinklers & Nozzles · Wet, Dry, Deluge & Preaction · Control Valves & Devices · Grooved (Germany & UK) · Grooved · Alarm Devices & Monitoring. 1.5" Threaded Check Valve, Weep Hole, No-Hub. Model PS-CVWNH. Where to buy. Check Valve Description 1.5" Threaded Check Valve, Weep Hole, No-Hub. Minimize Water Hammer Caused by Water Flow Reversal. The Tyco® Model CV-1FR is a compact and rugged swing-type unit that enables water flow in one direction and ... Compact one piece body, fully retained O-ring seal, poppet type check valve. Available in 1/4” and 1/2” NPT in brass or 316 stainless steel. Suitable for ... Swagelok® check valves are designed to allow fluids to flow in one direction only. Our check valves are available in a variety of designs, including poppet, ... 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 ... The Series 3600 Swing Check Valves prevent backflow in irrigation water control lines. Features: Cast aluminum body combines lightweight strength and corrosion ...