Spring-assisted piston lift check for small-bore, high-pressure instrument and process non-return service in vertical or horizontal installation.
The forge lift check valve uses a spring-loaded piston disc that lifts axially against the seat in response to forward flow, then closes instantly when flow ceases or reverses. The guided piston prevents the disc from cocking or jamming — a common failure mode in small-bore swing checks at high velocities. The spring-assist also enables horizontal installation without relying on gravity for closure.
VALVAX forge lift check valves comply with API 602 and ISO 15761, with forged ASTM A105 or F316 bodies. They are used extensively as instrument check valves, pump discharge non-return valves in chemical injection service, and in-line non-return protection on small-bore sampling systems and hydraulic actuation lines.
| Parameter | Value |
|---|---|
| Design Standard | API 602 / ISO 15761 |
| Size Range | ½″ – 1.5″ (DN15 – DN40) |
| Pressure Class | ASME Class 800 – 2500 |
| Face to Face | API 602 / ASME B16.10 |
| End Connections | SW / BW / NPT / RF Flanged |
| Body Material | A105 / F316 / LF2 / F22 / F51 |
| Piston / Spring | SS316 / Inconel 718 |
| Seat Ring | SS316 / Stellite 6 HF |
| Design Temp. | -196°C to +593°C |
| Testing | API 598 |
ASTM A105
General small-bore non-return service in oil, gas, and water at Class 800–2500.
ASTM A182 F22
High-temperature instrument non-return on HP steam and hot oil lines in power and refinery plants.
ASTM A182 F316
Chemical injection, corrosive media, cryogenic, and sanitary process non-return applications.
ASTM A182 F51
Offshore instrument and chemical injection non-return in sour and chloride-rich environments.
Corrosion inhibitor, scale inhibitor, and methanol injection non-return on offshore and onshore wells.
Instrument impulse line non-return, chemical dosing check valves, and drain valve protection.
In-line check valves on sample conditioning systems, analyser sample lines, and HP gauge protection.
Hydraulic control line non-return, subsea chemical injection, and wellhead instrument protection.
HP hydrogen non-return on instrument connections, compressor bypass, and HP reactor instrument lines.
Tell us your size, pressure class, fluid, and installation orientation — we will specify the correct spring and material configuration.