Lift Check Valves sourcingAbout Lift Check Valves
Lift check valves with piston or disc closure for steam, boiler feed and high-pressure process lines, DN15 to DN300, in forged and cast carbon steel, alloy and stainless grades.
A lift check valve is a non-return valve whose disc or piston rises vertically off its seat under forward flow and reseats under gravity and back pressure when flow stops. The seat is machined into the body much as in a globe valve, which gives a short, well-guided disc travel and a tight metal-to-metal shut-off that tolerates high pressures and temperatures far better than a hinged disc. That makes lift checks the usual choice on steam lines, boiler feed circuits, condensate systems and high-pressure gas service. Piston-pattern valves add a dashpot above the disc that cushions closure on pulsating flow from reciprocating pumps and compressors. Standard-pattern valves work only in horizontal lines because the disc must lift vertically; vertical-pattern and spring-assisted versions are made for vertical upward flow or free orientation. Indian manufacturers typically supply forged A105, F11, F22, F304 and F316 bodies in sizes DN15 to DN50 with socket-weld, screwed or flanged ends, and cast WCB, WC6, WC9 and CF8M bodies up to about DN300 flanged, with ratings from ASME class 150 to 2500, pressure-temperature ratings to ASME B16.34, face-to-face to ASME B16.10 for flanged valves and testing to API 598. When enquiring, state size, rating, pattern, orientation, body and trim material, end connection, service medium and temperature, and quantity.
