Bulk Ball Valves from a China Ball Valve Supplier

Zhuhai Kunjian Technology Co., Ltd. is a China ball valve supplier with its own manufacturing facility. We produce trunnion mounted, floating, and cryogenic ball valves for bulk industrial supply, built to API 6D, API 608, ASME B16.34 and BS 5351. Our range covers 1/2" to 60" (DN15–DN1500) in Class 150 to Class 2500. Buyers source bulk ball valves directly from our factory for oil and gas, LNG, petrochemical, water treatment, and power projects.

Share your line conditions like size, pressure class, media and temperature. Our engineering team will send back a valve specification with a factory quotation.

Ball Valve Models and Specifications

• Stainless Steel Floating Ball Valve: 1/2" to 12" (DN15–DN300), Class 150 to Class 600 or PN 16 to PN 64, in SS 304, SS 316 and SS 316L. Flanged, threaded or socket weld ends.
• Three-piece Trunnion Mounted Ball Valve: 2" to 48" (DN50–DN1200). The center body section comes out for seat and seal replacement while the end sections stay in the line.
• Two-piece Trunnion Mounted Ball Valve: API 6D, ASME B16.34 and API 608. WCB, LCC, CF8 and CF8M bodies, full or reduced bore, RF, RTJ or butt-weld ends, ISO 5211 mounting pad for manual or automated operation. Double block and bleed, API 607/6FA fire-safe design, anti-static device and blowout-proof stem.
• Forged Steel Trunnion Ball Valve: 2" to 48" (DN50–DN1200), Class 150 to 2500. A105, LF2, F304, F316 and F51, with custom alloys available. Double block and bleed, API 607/6FA fire-safe design, stem and seat sealant injection fittings.
• Cast Steel Trunnion Mounted Ball Valve: NPS 2" to NPS 24" (DN50–DN600).
• Hard Seal Trunnion Ball Valve: 2" to 60" (DN50–DN1500), metal-seated.

Also in the range: API 6D Trunnion Mounted and High Pressure Trunnion Mounted ball valves, with full datasheets on each product page.

Trunnion range: ASME Class 150 to 2500. Flanged (RF, RTJ) and Butt-Weld (BW) end connections.

Floating or Trunnion: How to Specify

Specify floating up to DN300 and Class 600. The seats carry the ball and line pressure assists the seal, which keeps the valve compact and economical. Above DN300 or above Class 600, specify trunnion mounted. The ball is anchored on trunnions and the seats are spring-loaded, so operating torque stays low on large-bore, high-pressure lines and actuators can be sized smaller. A DN50 Class 150 water line does not need trunnion construction; a DN400 or Class 900 line cannot use a floating valve.

Our ball valves use a quarter-turn design so that operators can move from fully open to fully closed with a 90-degree turn, faster and with less wear than multi-turn valves like gate valves. Full-bore ball valves open to the same internal diameter as the connecting pipe. For buyers running long pipeline segments, that difference compounds over distance in a way a partial-bore valve can't match. Seats are available in PTFE, RPTFE, and metal-seated options.

Testing and Safety Features

Every valve is pressure tested before dispatch: hydrostatic shell test at 1.5 times rated pressure and seat test at 1.1 times. Forged steel and two-piece trunnion models add double block and bleed and API 607/6FA fire-safe design, so one valve gives positive isolation with a verifiable bleed point. Material certificates and the test procedure are shared before production starts. Test reports ship with the valves.

Industries and Service Fit

• Oil, gas and petrochemical: trunnion mounted, Class 150 to 2500, RF, RTJ or butt-weld ends.
• LNG and industrial gases: cryogenic models with extended bonnet.
• Water and wastewater: stainless steel floating, flanged or threaded.
• Power: hard seal trunnion, metal-seated for high-temperature or abrasive media.
• Corrosive media: CF8M bodies, or F51 on forged steel trunnion valves.
• Cryogenic Ball Valves for LNG and Industrial Gas

Our cryogenic ball valves manufacturer line serves LNG, liquid oxygen, nitrogen and argon service with two models: the Cryogenic Ball Valve and the Stainless Steel Cryogenic Ball Valve. They can survive at -196, -150, -80, and -20 degrees C. Bodies are high-grade stainless steel (CF8M/CF3M) and austenitic stainless steel (SS304/316L); LCB covers -46°C service. Their extended bonnet design prevents frost build-up and also ensures the stem seal remains functional in cryogenic conditions. Seats are PCTFE/Kel-F. Production follows BS 6364 and ISO 17292.

Bulk Supply, MOQ and Lead Time

MOQ and lead time on bulk ball valves are quoted against your datasheet, not a flat figure. Body type (cast or forged), size, class and material set both. Special material or inspection requirements in the datasheet are priced and scheduled in the same quotation, so delivery dates can be fixed against your project schedule. Floating and trunnion valves for one project can go into a single RFQ.

In our custom production, we offer options like custom sizes, pressure ratings, actuation, and connection types. Also, we have multiple material types for the shell and seat of valves for each application.

To quote, send: size (NPS/DN), pressure class, media, minimum and maximum temperature, end connections, body and seat material, bore (full or reduced), operation (manual or automated), applicable standard and quantity.

Documents and Verification

Procurement teams qualifying a China ball valve supplier audit three records: the business licence, material certificates and pressure test records. We provide all three on request, so your engineering and QA teams can check them before you place an order.

FAQ

Which valve type should I specify above DN300?

Trunnion mounted. Our floating range ends at DN300 (12") and Class 600.

Can the valves be automated?

Yes. Two-piece trunnion valves carry an ISO 5211 mounting pad for manual or automated operation, and the trunnion design lowers operating torque, so actuators can be sized smaller.

Which models offer double block and bleed and fire-safe design?

Forged steel and two-piece trunnion models, with API 607/6FA fire-safe design.

Which materials are available for corrosive or low-temperature service?

Forged steel trunnion valves: A105, LF2, F304, F316 and F51, with custom alloys available. Two-piece: WCB, LCC, CF8 and CF8M. Cryogenic: CF8M/CF3M and SS304/316L.