Trunnion Mounted Ball Valve
Heavy-duty design with additional mechanical anchoring of the ball for high-pressure and large-diameter pipelines.
Technical Specifications
| Type | Trunnion Mounted |
| Size Range | 2" to 48" (50 mm to 1200 mm) |
| Body Materials | Carbon Steel (WCB), SS304, SS316, CF8/CF8M, Duplex |
| Ball Material | SS304 / SS316 / Inconel Overlay |
| Seat Material | PTFE, RPTFE, PEEK, Metal Seated, DBB |
| Stem Design | Blow-out proof, anti-static, fire-safe |
| End Connections | Flanged, Butt Weld |
| Pressure Rating | Class 150 / 300 / 600 / 900 / 1500 / 2500 |
| Standards | API 6D, API 6FA, ASME B16.34 |
Applications
Pipelines, Power Plants, Petrochemical, LNG, Offshore
About the Trunnion Mounted Ball Valve
The trunnion mounted ball valve is engineered for high-pressure and large-diameter pipeline applications where the loads generated on the ball seats would otherwise cause seal deformation in a floating-ball design. Unlike floating ball valves, the ball in a trunnion design is mechanically anchored at the top and bottom by trunnion bearings, which absorb line pressure thrust and allow the seats to float spring-loaded against the ball - maintaining seal integrity at all pressures from near-zero to full rated pressure class.
This upstream/downstream seat arrangement makes trunnion ball valves the preferred choice for Class 300 through Class 2500 applications in oil & gas transmission pipelines, refineries, LNG terminals, and offshore platforms. The fixed ball position also dramatically reduces operating torque, enabling reliable automated operation with smaller actuators than an equivalent floating-ball design would require.
Vajra Industrial Solutions supplies trunnion mounted ball valves in sizes from 2" to 48" in body materials including Carbon Steel (WCB, WC6, WC9), Stainless Steel (CF8M), Duplex (CD4MCu), and Super Duplex. All feature blow-out-proof stems, anti-static devices, and fire-safe designs compliant with API 6FA and ISO 10497. DBB (Double Block & Bleed) and DIB-1/DIB-2 configurations are available for metering skid and chemical injection service. Full material traceability, hydrostatic and low-pressure gas seat tests per API 6D, and Mill Test Reports (MTR) are standard with every order.
Where It's Used
Key industries and applications for the Trunnion Mounted Ball Valve
Oil & gas transmission pipelines
Class 600–1500 trunnion ball valves for main line block valves, launcher/receiver pig traps, and station isolation; piggable DBB designs to API 6D
LNG terminals and FLNG
cryogenic-service trunnion ball valves in LTCS (A352 LCC) or SS316 with PCTFE seats, extended bonnets, and vaporiser bypass service down to -196°C
Refineries and petrochemical plants
fire-safe trunnion ball valves in API 6FA-tested design for crude oil, naphtha, hydrogen, and flare header service; full-bore and reduced-bore options
Offshore platforms and FPSOs
Duplex / Super Duplex trunnion ball valves for HIPPS and ESD shutdown service; NACE MR0175 compliant for sour gas environments
Power generation and industrial plants
large-diameter trunnion ball valves for cooling water, BFW (boiler feed water) make-up, and auxiliary steam system isolation
How to Choose the Right Trunnion Mounted Ball Valve
Select a trunnion ball valve over a floating ball valve when: (a) pipe size is 6" or larger AND pressure class is 300 or higher; (b) the valve will see frequent operation or automated cycling; (c) a DBB function is required for positive isolation; or (d) operating torque limits dictate smaller actuator sizing. For sizes below 4" at Class 150–300 in clean, non-abrasive service, a floating ball valve is usually more cost-effective.
Popular Configurations
Most commonly ordered specifications for the Trunnion Mounted Ball Valve
Frequently Asked Questions
About Trunnion Mounted Ball Valve - ordering, specs, delivery & compliance
What standards does the Trunnion Mounted Ball Valve comply with?+
Our Trunnion Mounted Ball Valve complies with API 6D, API 6FA, ASME B16.34. All products are manufactured to international standards and come with full material test reports (MTR), dimensional inspection reports, and hydrostatic test certificates on request.
What materials are available for the Trunnion Mounted Ball Valve?+
The Trunnion Mounted Ball Valve is available in Carbon Steel (WCB), SS304, SS316, CF8/CF8M, Duplex. Material selection depends on your process fluid, temperature, pressure, and corrosion requirements.
What is the delivery lead time for Trunnion Mounted Ball Valve?+
Standard stock sizes are available for immediate dispatch from our Vadodara warehouse. Custom sizes and special materials typically have a lead time of 2–6 weeks depending on specifications. We serve customers across India within 1–7 business days and export to the Middle East, Southeast Asia, Europe, and the Americas with full export documentation.
Can I get a custom Trunnion Mounted Ball Valve for a specific application?+
Yes. Vajra Industrial Solutions supplies custom-engineered ball valves for specific process conditions. Submit your technical requirements - including pressure class, temperature range, fluid type, end connections, and any special trim or coating needs - via our RFQ form or WhatsApp, and our engineering team will respond within 24 hours.
What pressure ratings are available for the Trunnion Mounted Ball Valve?+
The Trunnion Mounted Ball Valve is available in pressure ratings of Class 150 / 300 / 600 / 900 / 1500 / 2500. Higher-pressure classes are available for critical service applications in oil & gas, power generation, and chemical processing.
How do I request a quote for the Trunnion Mounted Ball Valve?+
You can request a quote by clicking the "Request Quote" button on this page, filling out our RFQ form at vajravyuh.com/rfq, emailing us at sales@vajravyuh.com, or WhatsApping us directly at +91-9979774557. Please include quantity, size, pressure class, material grade, and end-connection type for the fastest response.
Need a Quote for Trunnion Mounted Ball Valve?
Our technical sales team responds within 24 hours. Share your specs and get competitive pricing.
Other Ball Valves
Floating Ball Valve
Standard floating design where the ball is supported by two seat rings, ideal for low to medium pressure applications.
View Details →
V-Port Ball Valve
Control valve with V-shaped ball or seat for precise flow regulation and throttling applications.
View Details →
Double Block & Bleed Ball Valve
DBB design with two independent seating surfaces and a bleed valve for positive isolation and cavity venting in critical services.
View Details →
3-Way Ball Valve
T-port or L-port ball valve for flow diversion, mixing, or directing flow between two circuits.
View Details →