API 6D Specification for valves (absorbed RP 6DR)
CurrentLatest edition found. Still confirm amendments with the publisher.
- Edition
- 25th ed. Nov 2021
- Publisher
- API
- Part family
- Valves
- Reviewed
- 22 October 2026 · source checked
Is API 6D still current?
Yes. 25th ed. Nov 2021 is the latest edition MechAtlas found (MechAtlas review: 22 October 2026). Check the publisher for amendments before you specify it.
What it covers
Specification for valves (absorbed RP 6DR)
Equivalent and related standards
| Standard | Relationship | Note |
|---|---|---|
| ISO 14313 | Similar purpose — not interchangeable without an engineering check |
“Similar” never means interchangeable without an engineering check.
Parts that use API 6D
- Ball valve (USA (ASME / ASTM), main)
Quarter-turn valve with a drilled ball that opens or closes flow; used for quick tight shut-off.
Grades: Class 150 to 2500
Pipeline valves (ball, gate, check, plug). - Check valve (USA (ASME / ASTM), main)
Valve that lets flow pass one way and closes automatically to stop back-flow.
Grades: Class 150 to 2500
Pipeline check valves.
Official source
MechAtlas does not reproduce standards. Check the official edition at the publisher's page for API 6D or the API store.
Open in MechAtlasCheck a drawing callout
Other valves standards
- API 598 / ISO 5208 / EN 12266-1 Changing
Valve inspection and pressure testing - API 526 / 527 / 520 / ISO 4126 Current
Relief valve dimensions, seat tightness, sizing - API 594 Current
Check valves: flanged, lug, wafer and butt-welding - API 598 Current
Valve inspection & testing - API 600 Current
Steel gate valves - API 602 / 608 / 609 Current
Compact gate, ball, butterfly valves - ASME B16.10 / EN 558 Current
Face-to-face dimensions - ASME B16.34 Current
Valves — flanged, threaded & welding end - AWWA C504 Current
Rubber-seated butterfly valves (water) - BS 1868 Current
Steel check valves, flanged and butt-welding, petroleum industry - EN 1171 Current
Cast iron gate valves - EN 16767 Current
Metallic check valves