Trunnion Ball Valve Manufacturer for High Pressure Pipeline Service
ZONCIC is a professional trunnion ball valve manufacturer supplying trunnion mounted ball valves for oil and gas pipelines, petrochemical plants, refinery units, power generation systems and severe service industrial applications. As a reliable trunnion ball valve manufacturer, we focus on high pressure shut-off, low operating torque, stable sealing and export-ready project documentation.
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What Is a Trunnion Mounted Ball Valve?
A trunnion mounted ball valve uses upper and lower trunnions to mechanically support the ball. Unlike a floating ball valve, the ball remains fixed while the seats move toward the ball under pressure. This structure helps reduce operating torque and improves sealing stability in high pressure and large diameter pipeline service.
ZONCIC works as a trunnion ball valve manufacturer for distributors, EPC contractors, pipeline contractors and industrial end users who need dependable shut-off valves for demanding project conditions.
For other ball valve structures, review our flanged ball valve, top entry ball valve and three piece ball valve pages.
Trunnion Ball Valve Manufacturer Advantages
Low Operating Torque
The trunnion-supported ball design reduces seat load on the ball and helps operators or actuators achieve smoother operation in large sizes.
High Pressure Capability
Trunnion mounted ball valves are suitable for Class 150 to Class 2500 pipeline service, depending on material, seat design and project requirements.
Stable Sealing Performance
Spring-loaded seat design, controlled machining and pressure testing support reliable isolation for oil, gas and severe service pipelines.
Trunnion Ball Valve Manufacturer Technical Specifications
As an export-oriented trunnion ball valve manufacturer, ZONCIC supplies API 6D trunnion mounted ball valves with flanged or butt weld ends, soft seat or metal seat options, and manual, gear, pneumatic, electric or hydraulic operation.
| Item | Specification |
|---|---|
| Valve Type | Trunnion Ball Valve / Trunnion Mounted Ball Valve |
| Size Range | 2″ to 48″ / DN50 to DN1200 |
| Pressure Rating | Class 150 to Class 2500 / PN16 to PN420 |
| Body Material | WCB, LCB, CF8, CF8M, Duplex Stainless Steel, Alloy Steel |
| Ball Material | SS304, SS316, SS316L, Duplex Stainless Steel |
| Seat Material | PTFE, RPTFE, Nylon, PEEK, Devlon, Metal Seat Optional |
| End Connections | Flanged, Butt Weld |
| Operation | Lever, Gear, Pneumatic Actuator, Electric Actuator, Hydraulic Actuator |
| Design Standard | API 6D, ASME B16.34, ISO 17292 |
| Face to Face | API 6D, ASME B16.10 |
| Flange Standard | ASME B16.5, ASME B16.47, DIN, JIS, GOST |
| Inspection Standard | API 6D, API 598, ISO 5208 |
| Applicable Media | Natural Gas, Crude Oil, Refined Oil, Water, Steam, Chemical Media |
Main Parts and Materials
| No. | Part Name | Material Options |
|---|---|---|
| 1 | Body | WCB / LCB / CF8 / CF8M / Alloy Steel |
| 2 | Bonnet / End Cap | WCB / LCB / CF8 / CF8M / Alloy Steel |
| 3 | Ball | SS304 / SS316 / Duplex Stainless Steel |
| 4 | Upper Stem | SS410 / SS304 / SS316 |
| 5 | Lower Trunnion | SS410 / SS304 / SS316 |
| 6 | Seat Ring | PTFE / RPTFE / Nylon / PEEK / Metal Seat |
| 7 | Stem Packing | PTFE / Graphite |
| 8 | Body Gasket | Graphite / Stainless Steel + Graphite |
| 9 | O-Ring | NBR / FKM / Viton |
| 10 | Spring | Inconel / Stainless Steel |
| 11 | Bolts & Nuts | B7 / 2H / B8 / B8M |
Reference Dimensions
| Size | DN | L mm | H mm | W/Gear mm | Connection | Pressure Class |
|---|---|---|---|---|---|---|
| 2″ | 50 | 178 | 180 | 250 | Flanged | 150 / 300 / 600 |
| 3″ | 80 | 203 | 210 | 300 | Flanged | 150 / 300 / 600 |
| 4″ | 100 | 229 | 250 | 350 | Flanged | 150 / 300 / 600 |
| 6″ | 150 | 394 | 330 | 500 | Flanged / Butt Weld | 150 / 300 / 600 / 900 |
| 8″ | 200 | 457 | 390 | 650 | Flanged / Butt Weld | 150 / 300 / 600 / 900 |
| 10″ | 250 | 533 | 460 | 800 | Flanged / Butt Weld | 150 / 300 / 600 |
| 12″ | 300 | 610 | 530 | 950 | Flanged / Butt Weld | 150 / 300 / 600 |
| 16″ | 400 | 686 | 680 | 1200 | Flanged / Butt Weld | 150 / 300 |
| 20″ | 500 | 762 | 820 | 1500 | Flanged / Butt Weld | 150 / 300 |
| 24″ | 600 | 914 | 980 | 1800 | Flanged / Butt Weld | 150 / 300 |
Quality Control from a Trunnion Ball Valve Manufacturer
ZONCIC controls trunnion mounted ball valve production from raw material inspection to machining, assembly, pressure testing and export packing. This makes ZONCIC a practical trunnion ball valve manufacturer for projects requiring stable quality and documentation support.
- Raw material inspection and material certificate verification
- Body, ball, seat and stem dimensional checking
- PMI, NDE, PT, MT or UT inspection support when required
- Hydrostatic shell and seat pressure testing
- Fire-safe, anti-static and double block and bleed options
- Marking verification, anti-rust protection and export packing control
For technical standards reference, buyers may review API and ASME.
Applications of Trunnion Mounted Ball Valves
Trunnion mounted ball valves are widely used where stable shut-off, low torque and long-term sealing performance are required under high pressure or large diameter conditions.
- Oil and gas transmission pipelines
- Petrochemical and refinery plants
- Natural gas distribution stations
- Offshore and onshore energy projects
- Power generation and utility systems
- Large diameter industrial process piping
Trunnion Ball Valve FAQ
Learn more about trunnion mounted ball valves, API 6D requirements, material selection and industrial pipeline applications.
What is a trunnion mounted ball valve?
A trunnion mounted ball valve is designed with additional mechanical anchoring support for the ball, reducing operating torque and improving sealing performance under high pressure conditions. It is widely used in oil & gas transmission, petrochemical plants and critical shut-off systems.
What is the difference between floating and trunnion ball valves?
Floating ball valves rely on line pressure to push the ball against the downstream seat, while trunnion ball valves use upper and lower supports to stabilize the ball. Trunnion mounted ball valves are preferred for larger sizes and higher pressure classes.
Are API 6D trunnion ball valves suitable for pipeline service?
Yes. API 6D trunnion ball valves are specifically designed for long-distance pipeline systems and critical shut-off applications in oil & gas, LNG, petrochemical and refinery industries.
What materials are available for trunnion ball valves?
ZONCIC supplies trunnion mounted ball valves in WCB, LCB, WC6, WC9, CF8, CF8M, duplex stainless steel and alloy steel materials according to working pressure, temperature and media requirements.
Can you provide OEM and project customization?
Yes. We support OEM marking, customized materials, actuator configurations, project documentation, third-party inspection and international export packing according to project requirements.
What testing standards are applied?
Trunnion ball valves are tested according to API 598, API 6D and customer project specifications, including shell pressure test, seat leakage test, dimensional inspection and optional PMI or NDT inspection.
Looking for a Reliable Trunnion Ball Valve Manufacturer?
ZONCIC supplies API 6D trunnion mounted ball valves for oil & gas, petrochemical, LNG, power generation and industrial pipeline systems. Send us your valve size, pressure class and material requirements for a fast quotation.
Industry Standards & Technical References
Learn more about industrial valve standards, testing requirements and pipeline valve specifications.