Fig. IV-6D31 · Oil & Gas
API 6D Swing Check Valve
Full-opening swing check for pipeline and process non-return duty
API 6D design & testAPI 598 supplementary tests as specified
Full-opening swing check valve supplied to API 6D from qualified manufacturers for pipeline and process lines that must pass pigs or maintain a clear bore. A bolted cover gives access to the disc and seat. Dashpots or counterweights are added where slamming on pump stop or flow reversal is a risk. Tests follow API 6D at the manufacturing plant.
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-6D31 |
|---|---|
| Size range | 2″ – 36″ (DN50 – DN900) |
| 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 seat: 13Cr, F316, overlay as specified |
| Design standards | API 6D · ASME B16.34 · ASME B16.10 |
| Certifications (per manufacturer) | API 6D design & test · API 598 supplementary tests as specified |
Key features
- Full-opening swing disc — piggable designs available
- Bolted cover; renewable seat rings
- Optional dashpot, counterweight or position indicator
- Horizontal or vertical-up flow as specified
- Shell and seat tests to API 6D
- NACE-compliant trim available for sour service
