Independent, licence-checked valve sourcing from Wenzhou
One RFQ, several API-licensed factories, the manufacturer named in your quotation, inspection agreed before shipment.
ValveTrace is a sourcing desk, not a valve manufacturer. We read every factory licence by its expiry date in the API Composite List, send your RFQ to the factories whose licence scope covers it, and compare their offers against your datasheet before we quote.
- Valve ranges
- 8
- Wenzhou API 609 entries
- 41
- Active but past expiry
- 3
- Registry read
- 8 Nov 2026
How it works
- 01Send the datasheet you haveValve type, size, pressure class, body material and quantity are enough to start. Add end connections, service, testing requirements, destination port or country and end-user country when you have them.
- 02We review it and check the licenceWe read the specification against the service, screen the destination and end user, and re-check the API licence of every factory we ask by its expiry date in the API Composite List.
- 03Several factories quote, you get one quotationYour RFQ goes to the panel factories whose licence scope covers the valve. We compare their offers against your datasheet, line by line, and send one quotation with a technical deviation list that names the manufacturer and its licence number.
- 04Inspection is agreed before shipmentThe inspection and test plan, the witness points and any third-party inspector you name are fixed before the order. Test records, EN 10204 3.1 material certificates and the delivery document pack follow the shipment.
Valve ranges
Engineered valves for oil and gas, LNG, petrochemical, power and offshore projects. Each range page covers selection, materials, testing and the API licence the manufacturer must hold.
- Ball valves · API 6DTrunnion ball valvesA trunnion mounted ball valve holds the ball on a fixed shaft at the top and bottom, so line pressure is carried by the trunnions instead of the downstream seat.
- Butterfly valves · API 609Triple offset butterfly valvesA triple offset butterfly valve adds a third, angular offset to the seat cone, so the disc seal touches the seat only at the moment of closing.
- Low-temperature service · BS 6364Cryogenic ball valvesA cryogenic ball valve is built for fluids such as LNG, liquid nitrogen and liquid oxygen.
- Ball valves · Duplex stainlessDuplex ball valvesDuplex 2205 and super duplex 2507 ball valves are used where chlorides cause pitting in 316 stainless steel, such as seawater and offshore service.
- Ball valves · API 6DTop entry ball valvesA top entry ball valve has a one-piece body with a bolted bonnet on top, so the ball, seats and stem can be removed for repair without cutting the valve out of the line.
- Ball valves · API 6DFully welded ball valvesA fully welded ball valve has a sealed steel body with no bolted body joint, made by welding the body parts together.
- Ball valves · API 6DDouble block and bleed ball valvesA double block and bleed ball valve isolates a line section with two seating surfaces and a bleed port between them, so the space can be vented and checked at zero pressure.
- Ball valves · API 6D · API 608Metal seated ball valvesA metal seated ball valve uses metal-to-metal contact between the ball and the seat instead of a soft polymer insert, so it can seal at high temperature and in abrasive service where PTFE or PEEK would degrade.
Why buy through us
| What you need | Factory website | General sourcing agent | Directory or marketplace | ValveTrace |
|---|---|---|---|---|
| Quotes from more than one licensed factory | One factory’s own range | Several suppliers, across all product types | You contact and compare listings yourself | Your RFQ goes to the panel factories whose licence scope covers the valve |
| API licence checked by expiry date | Certificate images; no licence number or registry link on the pages reviewed | Not shown on the guides reviewed | Supplier profiles reviewed did not show API licence status | Registry expiry date, re-checked every quarter |
| Valve-specific engineering | For its own products | General process guides, not API scope or valve classes | Not provided | Deviation list against your datasheet with each quotation |
A sourcing desk, and why the manufacturer is not named here
We do not make valves, and this website does not name our panel factories or print their licence numbers. Your quotation names the manufacturer of the valve you are quoted, its API licence number and where to check it in the API Composite List, so you can verify the source before you order. Until then, several factories compete for the same enquiry.
“Active” in the registry is not enough
In our check of the API Composite List on 8 Nov 2026, 3 of the 41 API 609 licences held by Wenzhou companies were still shown as Active after their expiry date. We judge every panel factory by the date, not the flag, and re-check the registry every quarter.
Buyer guides
Guides for the buyer, not the seller: how to read the API Composite List, what to put in an RFQ and what inspection before shipment covers. No guide names a factory or makes a partner-factory claim.