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Lift Check Valve
Technical Detail
Seat Leakage:
Class IV for Flexible Metal Seats, Class VI for PTFE, EPDM, Viton Soft Seats
Design And Manufacturing:
BS 5352, API 602, ISO 15761, ASME B16.34
Size Range :
1/2” to 2”
Pressure Rating:
ASME Class 150 / 300 / 600 / 800 / 1500 / 2500
Valve Face To Face Dimension:
ASME B16.10 (Flanged), Manufacturers Standard (Threaded / Socket)
End Conformity:
ASME B16.5 / ASME 16.11 / ASTM B 1.20
Inspection & Testing:
API 598 / BS EN 12266-1
Description
Lift-Check Valve is a check valve in which the disc, sometimes called a lift, can be lifted up off its seat by higher pressure of inlet or upstream fluid to allow flow to the outlet or downstream side. A guide keeps motion of the disc on a vertical line, so the valve can later reseat properly. When the pressure is no longer higher, gravity or higher downstream pressure will cause the disc to lower onto its seat, shutting the valve to stop reverse flow.
Spring-loaded lift check valves can be installed in the piping in almost any mounting position. Compared with swing check valve their head losses are higher as the deflection of the flow is much more significant. Lift check valves are preferred when applications require smaller nominal diameter.
Features
- Rugged, all-stainless steel construction
- Reverse flow coefficient less than 0.1 % of forward flow coefficient
- Energy efficient due to low cracking pressure
- Metal Seated provides a long service life in elevated temperature applications
Material Construction:
| Description | Material | F304 | F316 |
| Body | ASTM A105 | A182-F304 | A182-F316 |
| Bonnet | ASTM A105 | A182-F304 | A182-F316 |
| Disc | S.S.410 | S.S.304 | S.S.316 |
| Seat | SS / 13 % Cr | Stellite | |
| Fastener | High Tensile Steel | S.S 202 | S.S.304 |