Triple offset butterfly valve manufacturers in China
Manufacturers · API 609
Triple offset butterfly valves fall under API 609. This page states how many signed panel factories held an API 609 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 609 licence covers
API 609 covers butterfly valves in Category A and Category B, in the sizes, classes and materials listed in the licensed scope. The licence belongs to the manufacturer, so read the scope line in the registry entry for the valve type and class you need.
A triple offset seat is a design detail, not a licence category. The licence says which butterfly valves a factory may make; the datasheet and the test record say whether the design meets your shut-off, torque and fire-test requirement.
Frequently asked questions
- Who are the manufacturers of triple offset butterfly valves?
- Global valve groups and a number of Chinese factories make them, many of them in Wenzhou. Compare manufacturers by an API 609 licence that is in force by its expiry date, the seat design and the test record, not by catalogue claims.
- What makes a butterfly valve triple offset?
- Two offsets of the shaft, behind the seat and off the pipe centreline, plus a third, angular offset of the seat cone. The disc then touches the seat only at final closure.
Standards cited
- API Std 609: Butterfly valves: Category A (concentric) and Category B (double and triple offset) for ASME Class 150 to 600.