Fig. IV-6D32 · Oil & Gas
API 6D Dual-Plate Check Valve
Compact dual-plate (wafer) check for pipeline and process service
API 6D / API 594 design & testAPI 598 supplementary tests as specified
Dual-plate check valve supplied to API 6D and API 594 from qualified manufacturers. Two spring-loaded plates close quickly to limit slam, and the wafer or short-pattern body saves length and weight between flanges — a frequent choice on pump discharges and compressor stations. Retainerless designs avoid body penetrations on hydrocarbon service.
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-6D32 |
|---|---|
| Size range | 2″ – 48″ (DN50 – DN1200) |
| Pressure rating | ASME Class 150 – 2500 |
| End connections | Wafer, lug or double-flanged |
| Typical materials | Body: ASTM A216 WCB, A352 LCC, A351 CF8M, duplex; plates and springs: stainless, Inconel or as specified |
| Design standards | API 6D · API 594 · ASME B16.34 |
| Certifications (per manufacturer) | API 6D / API 594 design & test · API 598 supplementary tests as specified |
Key features
- Dual spring-loaded plates; low slamming tendency
- Wafer, lug or double-flanged body
- Retainerless options for hydrocarbon service
- Independent plate stop to protect the seat
- Tests to API 6D / API 594 as specified
- NACE-compliant internals available for sour service
