PISTON CHECK VALVE
SCV Valve
The SCV Piston Check Valve is a non-slam, flapperless check valve built to API 6D for pipeline backflow control. An internal piston rises off the seat as upstream pressure exceeds downstream, then lowers smoothly as flow drops, preventing the slam and seat damage of a conventional check.
The quiet, non-slam action suits pulsating flow lines from compressors and pumps, where a swing check would chatter and wear. Piston rings keep the piston aligned so its beveled face seats against the body’s metal seat, with a spring standard on 2″ through 6″ valves.
Available in sizes 2″ through 24″ and ASME Class 150 through 2500, the valve comes in cast carbon or stainless steel with threaded, replaceable seats. Flanged ends conform to ANSI B16.5 and butt-weld ends to ANSI/ASME B16.25, with continuous service to 400°F and NACE MR-01-75 construction available.
Typical Applications:
Pipeline backflow prevention, compressor and pump discharge, pulsating-flow lines, oil, liquid gas, and liquid service, and horizontal pipeline runs.
Key Features
- Non-slam, flapperless piston design
- API 6D design and test
- Sizes 2″ through 24″
- ASME Class 150 to 2500
- Internal piston with piston rings
- Metal-seated beveled sealing surface
- Threaded, replaceable seats
- X-750 spring standard on 2″ through 6″
- Cast carbon or stainless steel body
- Quiet operation on pulsating flow
- Flanged ends to ANSI B16.5
- Butt-weld ends to ANSI/ASME B16.25
- Continuous service to 400°F (204°C)
- Horizontal and specified vertical service
- Practically maintenance-free
- NACE MR-01-75 available
PERFORMANCE ADVANTAGES
Why the SCV Piston Check Valve Performs Where It Counts
NON-SLAM PROTECTION FOR THE LINE
The piston rises and lowers with the flow rate rather than slamming shut like a flapper, protecting the seat and the piping from the pressure surges a swing check produces. That extends service life and reduces water-hammer risk.
BUILT FOR PULSATING FLOW
The quiet, spring-assisted piston action suits compressor and pump discharge lines where pulsating flow makes a swing check chatter and wear. The valve holds a reliable seal in service that punishes conventional checks.
METAL-SEATED RELIABLE SHUT-OFF
Piston rings keep the piston aligned so its beveled face seats firmly against the body’s metal seat for dependable backflow prevention. Threaded, replaceable seats simplify refurbishment when service does call for it.
LOW-MAINTENANCE CAST CONSTRUCTION
The cast carbon or stainless body is practically maintenance-free in normal service, with a short spare-parts list of piston, rings, seals, and seat. NACE-compliant materials extend it into sour backflow-prevention duty.