Check valves are automatic shut-off valves that are commonly used for preventing backflow or drainage in a piping system. Often applied on the discharge side of pumps, check valves prevent the system from draining if the pump stops and protects against backflow, which could harm the pump and/or other equipment. Note: This valve is intended for liquid service that is steady, clean (no abrasives or solids), and non-pulsating. Flow-rate must not exceed 15 ft/sec. Not recommended for sever ozone-resistant applications. Features Economical Design: Low weight and short laying length produce savings in initial costs, space requirements, and installation when compared to full-body swing-type check valves Minimal Head Loss: Head loss is minimized by providing a short, straight and virtually unobstructed flow path - Additionally, the spring loaded disc is designed with very low cracking pressure which reduces the amount of energy required to open the valve Quick Closure to Reduce Water Hammer: Shut-off is achieved via the fully automatic, spring-assisted disc that closes near zero flow velocity - The lightweight, single disc design creates a positive shutoff prior to flow reversal which helps to keep surges to a minimum Durable & High Quality Design: The CV 31's ductile iron body maintains the anti-corrosive properties of cast iron while achieving a yield strength comparable to carbon steel - Ductile iron also offers higher pressure/temperature ratings than cast iron in the same pressure class - The CV 31 also features anti-corrosive, stainless steel trim (disc, spring, shaft) as standard Resilient Soft Seats: Field replaceable, resilient soft seats coupled with precision machined sealing surfaces help to ensure a bubble tight seal that meets or exceeds API 598 test requirements Specifications Sizes: 2 - 8 in. - Larger sizes available - Please call for more information Type: Wafer - Single Disc ASME Class: 125/150 Body: Ductile Iron (ASTM A536) Seat: Nitrile Rubber Disc: Stainless Steel ASME Class 150 Pressure/Temperature Rating: 250 PSI @ 100°F Nitrile Rubber Temp. Range: -20 - 250°F Stainless Steel Spring Temp. Rating: 450°F Low Cracking Pressure: 1/4 PSI Referenced Standards & Codes: ASME B16.42- Ductile Iron Pipe Flanges and Flanged Fittings; ASME B16.5 - Pipe Flanges and Flanged Fittings; API 594 - Wafer, Wafer-Lug, & Double Flanged Type Check Valve; API 598 - Valve Inspection and Testing; MSS SP-6 - Standards Finishes for Connecting-end Flanges; MSS SP-25 - Standard Marking System for Valves; MSS SP-55 - Quality Standard for Valve Castings Markets: General Industry, Chemical, Petrochemical, Power, and Food & Beverage Downloads Specifications Sheet (PDF Download)
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