Spring-assisted axial closure technology eliminates water hammer entirely, even on rapid pump trip in high-pressure gas and liquid pipeline service.
The axial flow non-slam check valve uses a spring-loaded, centrally guided poppet that moves axially within the flow path. The spring begins closing the poppet before forward flow velocity reaches zero, ensuring that the valve is fully closed when flow direction reverses. This pre-closure mechanism is the only reliable method of completely eliminating water hammer and reverse flow transients in high-energy pipeline systems.
VALVAX axial flow non-slam checks are designed to API 6D and are particularly suited to gas compressor discharge, pump discharge in high-pressure liquid hydrocarbon service, and pipeline pig-receiving applications. The streamlined axial flow path delivers pressure drop performance comparable to a fully open gate valve.
| Parameter | Value |
|---|---|
| Design Standard | API 6D / ASME B16.34 |
| Size Range | 2″ – 24″ (DN50 – DN600) |
| Pressure Class | ASME Class 150 – 2500 |
| Face to Face | API 6D / ASME B16.10 |
| End Connections | RF / RTJ / BW |
| Body Material | WCB / CF8M / LCC / WC6 / Duplex |
| Poppet Material | SS316 / Duplex / Inconel 625 |
| Spring Material | SS316 / Inconel 718 |
| Design Temp. | -196°C to +593°C |
| Testing | API 598 / API 6D |
ASTM A216 WCB
Gas and liquid hydrocarbon pipeline non-return and compressor discharge service at ambient temperature.
ASTM A217 WC6 / WC9
High-temperature compressor and pump discharge service in refinery and power generation applications.
ASTM A351 CF8M
Cryogenic and corrosive service including LNG, liquid oxygen, and chemical plant compressor discharge.
ASTM A890 4A / 5A
Offshore and subsea gas and liquid pipeline service requiring maximum chloride and sour gas resistance.
Compressor station discharge and pipeline isolation where reverse flow elimination is safety-critical.
LNG pump discharge and cryogenic compressor non-return service at temperatures down to -196°C.
Steam turbine bypass, boiler feed pump discharge, and high-energy steam line non-return service.
Subsea and topside gas export compressor discharge in duplex or alloy 625 for corrosive wellstreams.
Refinery compressor and pump discharge where water hammer has caused prior system failures.
Our engineers will size the spring and poppet geometry for your exact flow conditions and shut-off requirements.