API steel valves · Zhejiang, China
Steel valves that arrive with the dimensions and the documents right.
SYNHE manufactures gate, globe, ball, check and butterfly valves in its own foundry — WCB, CF8M, forged steel, alloy and duplex — to API 600, API 6D, API 609 and ASME B16.34, with three API monogram licences under API Spec Q1.
- API licences
- 3600 · 6D · 609
- Size range
- ½"–48"DN15–DN1200
- Pressure class
- 150–2500ASME · PN
- Plant area
- 66600square metre, 27000-Square metre foundry
- In-house foundryCast WCB, CF8M, alloy and duplex grades on our own 27000-square metre casting shop — no third-party casting dependency.
- API Q1 monogram programmeThree API monogram licences audited under API Spec Q1. Monogram applied only to licensed products and scopes.
- Traceable materialEN 10204 3.1 material test certificates with every shipment, heat-number traceable back to the ladle.
- Third-party inspection openSGS, TÜV, BV, Applus or your nominated inspector are welcome at our works before dispatch.
The line
Five families, one quality system
Gate, globe, ball, check and butterfly — cast, machined, tested and monogrammed in the same works. Every family page carries the dimensional data and the standard behind it.
- API 600600-0432
- API 6D6D-2150
- API 609609-0298
- ISO 9001[CONFIRM]
- ISO 14001[CONFIRM]
- ISO 45001[CONFIRM]
RFQ
How to reach the right valve, fast
Tell us the line conditions and the drawing, and we return a dimensional and material check against the governing standard before we quote. The table below is the minimum set of data that lets our engineers answer without going back and forth.
- Service
Medium, state, temperature range, differential pressure, flow
- Size & class
NPS / DN and ASME Class or PN rating, plus any project deviation
- Body material
ASTM grade — WCB, WCC, CF8M, WC6, WC9, A105, F316, 2205, 2507
- End connection
Flanged RF/FF/RTJ, butt-weld, socket-weld, threaded, wafer, lug
- Standard
API 600 / 602 / 603 / 6D / 594 / 609, ASME B16.34, EN 593, GOST, JIS
- Operation
Manual, gear, electric, pneumatic or gas-over-oil actuation
- Documentation
MTC 3.1/3.2, PMI, NDE scope, fire-safe or cryogenic test report
Industries
Where our valves work
References
Supply record
Project references are published only with buyer consent. Where a reference is under NDA we publish the technical envelope and the market instead of the name. Ask us for a named reference list for your audit.
Class 150–300 fully welded ball valves with gas-over-oil actuation, supplied against API 6D with monogram 6D-2150 and witnessed seat testing.
Class 150/300 WCB and CF8M bolted bonnet gate valves replacing a European brand on an existing piping class, matched on face-to-face and flange drilling.
Wafer dual plate check valves with EPDM seats and ductile iron bodies, retained on a recurring call-off contract.
Process
From enquiry to dispatch
- STEP 01Enquiry
Send the piping class, nameplate photo or the old drawing.
- STEP 02Engineering check
Face-to-face, flange drilling, material and standard verified before pricing.
- STEP 03Production
Own foundry, own machining — one quality system from ladle to packing.
- STEP 04Inspection & dispatch
API 598 testing, third-party inspection welcome, seaworthy export packing.
FAQ
Questions buyers ask
Which API standards do you hold monogram licences for?
Three: API 600 (licence 600-0432, bolted bonnet steel gate valves), API 6D (licence 6D-2150, ball, check and gate valves) and API 609 (licence 609-0298, butterfly valves Category B). All three run under API Spec Q1 and are verifiable on the API composite list.
What is your size and pressure range?
Cast steel gate, globe, ball and check valves from NPS ½ to NPS 48 (DN15–DN1200) in ASME Class 150 to 2500. Butterfly valves to NPS 60 in Category A and B. Compact forged steel valves to NPS 2 in Class 800/1500/2500 under API 602.
Can you replace an imported valve on an existing line?
Yes — this is a large part of our export work. Send the nameplate data or the original drawing: face-to-face, flange standard, end connection, trim number and actuation interface. We reverse-check against ASME B16.10 / B16.5 / B16.34 and EN 558 before we quote.
Do you supply material test certificates?
Every shipment includes EN 10204 3.1 mill test certificates for pressure-retaining parts, heat-number stamped on the body. PMI, hardness and impact testing can be witnessed, and 3.2 certification by a nominated third party is available on request.
What is the normal lead time?
Standard Class 150/300 gate, globe, ball and check valves in WCB and CF8M are typically 4–8 weeks depending on quantity. Engineered, large-bore and high-alloy valves are quoted with a project-specific schedule. [CONFIRM] final lead-time policy.
How do you handle packing and export documentation?
Valves are seaworthy-packed in plywood cases with end protectors, desiccant and individual crates for large bore. Commercial invoice, packing list, certificate of origin, MTCs and test reports ship with the goods; COO form types per destination on request.
Send the piping class, not the part number
We check the dimensions, the material and the standard before we price — which is the part that decides whether the valve actually fits. RFQ answered within one working day.