API 6D ball valve manufacturers in China
Manufacturers · API 6D
API Spec 6D covers pipeline and piping valves, including trunnion and floating ball valves. This page states how many signed panel factories held an API 6D licence in force when we last checked the API Composite List, judged by expiry date. One RFQ is quoted by several of them; the quotation names the manufacturer and its licence number.
Factory panel
| API specification | Signed panel factories with the licence in force | What the licence covers |
|---|---|---|
| API 6D | 4 | Ball, gate, plug and check pipeline valves |
| API 609 | 3 | Butterfly valves, Category A and Category B |
| API 608 | 2 | Metal ball valves, flanged, threaded and welding ends |
A licence counts only while its expiry date is after the registry check; the registry’s “Active” flag is never used on its own. Every factory counted has a signed panel agreement with us. Factory names and licence numbers are given in your quotation, with the link to verify them in the API Composite List. Read how we check a licence.
What an API 6D licence covers
API 6D sets requirements for design, manufacture, assembly, testing and documentation. The licence entry lists the valve types in scope; a factory licensed for ball valves is not automatically licensed for gate or check valves.
Frequently asked questions
- Who makes trunnion ball valves?
- Global valve groups and many API 6D licensed factories in China, a large share of them in Wenzhou. Check that the licence scope includes ball valves and that its expiry date is still ahead in the API Composite List.
Standards cited
- API Spec 6D: Pipeline and piping valves: design, manufacture, testing and documentation of ball, gate, plug and check valves.