API 6D Axial (Nozzle) Check Valve
Non-slam axial-flow nozzle check for compressor and pipeline duty
Axial-flow (nozzle) check valve supplied to API 6D from qualified manufacturers. A spring-assisted disc travels along the flow axis and closes before reverse flow develops, giving non-slam behaviour on compressor discharge, pump recycle and fast-reversing pipeline service. The streamlined bore keeps pressure drop low compared with a conventional swing check.
Products are supplied to the stated API / ISO / ASME / AWWA standards from qualified manufacturers for projects in Saudi Arabia, including Dammam, Jubail, Yanbu, Riyadh, Jeddah and the Eastern Province. Certifications, monograms and listings are those of the manufacturing plant and are provided as specified in the purchase order.
Technical specifications
| Figure number | IV-6D33 |
|---|---|
| Size range | 2″ – 24″ (DN50 – DN600), larger sizes on request |
| Pressure rating | ASME Class 150 – 2500 |
| End connections | RF / RTJ flanged or butt-weld |
| Typical materials | Body: ASTM A216 WCB, A352 LCC, A351 CF8M, duplex; disc and spring: stainless or nickel alloy as specified |
| Design standards | API 6D · ASME B16.34 · ASME B16.10 |
| Certifications (per manufacturer) | API 6D design & test |
Key features
- Axial (nozzle) disc — inherently non-slam
- Short closing stroke and spring assist
- Low pressure-drop venturi / nozzle body
- Silent operation on reciprocating and centrifugal compressors
- Tests to API 6D at the manufacturing plant
- Custom trim for high-cycle or sour service
