Trunnion Mounted Ball Valves
Heavy-duty API 6D pipeline ball valves engineered with top and bottom mechanical trunnion supports. Features spring-energized floating seats, true Double Block and Bleed (DBB) isolation, low operational torque, and certified fire-safe construction for critical high-pressure oil, gas, and energy transmission.
Mechanical Trunnion Support with Spring-Loaded Floating Seats
ENGIPRO SOLUTIONS LLP is a trusted manufacturer of Trunnion Mounted Ball Valves in India, engineered to deliver exceptional performance and absolute shut-off integrity across high-pressure pipeline applications. Unlike floating ball designs where line pressure forces the ball into the downstream seat, trunnion-mounted valves anchor the ball between upper and lower trunnion plates, absorbing pipeline thrust and allowing floating seat rings to seal against the ball under hydraulic force.
This mechanical architecture significantly reduces operating torque, eliminates excessive seat wear, and enables smooth, reliable actuation even at full differential pressure up to ASME Class 1500. Every ENGIPRO Trunnion Mounted Ball Valve incorporates certified Double Block and Bleed (DBB) capabilities, allowing operators to verify zero leakage by venting the body cavity while both upstream and downstream lines remain under full operational pressure.
Widely specified in cross-country oil and gas pipelines, natural gas transmission stations, offshore manifolds, LNG terminals, and refining facilities, our valves conform to API 6D, ASME B16.34, and BS EN ISO 17292 standards. Available with manual lever, precision worm gearboxes, heavy-duty pneumatic scotch yoke actuators, and electric fail-safe motor operators.
Special Features & Engineering Construction
Engineered to satisfy API 6D, ASME B16.34, and ISO 14313 benchmarks for critical hydrocarbon transmission.
Double Block & Bleed (DBB)
Simultaneous upstream and downstream sealing allows the central body cavity to be bled safely through a dedicated port to confirm seat isolation integrity.
Fire-Safe Certified
Designed and certified in accordance with API 607 and API 6FA. Features secondary metal-to-metal seating upon primary soft seal decomposition in a fire event.
Anti-Blowout Stem
Internally assembled stem with integral retention collar prevents stem blowout under full system pressure, ensuring plant and operator protection.
Low Operating Torque
Self-lubricating PTFE/metal composite trunnion bearings absorb line pressure loads, enabling effortless actuation with smaller actuators and gear units.
2-Piece & 3-Piece Construction
Available in side-entry two-piece or three-piece bolted bodies, facilitating inline serviceability and rigid structural integrity under pipeline stress.
Self-Relieving Cavity Seats
Spring-loaded floating seats automatically relieve overpressure back into the pipeline if trapped liquid in the cavity expands due to ambient heating.
Emergency Sealant Injection
Fitted with standard stem and seat emergency sealant injection fittings with internal check valves to restore seal integrity during field upsets.
ISO 5211 Direct Automation
Standard ISO 5211 mounting flange accommodates direct coupling to pneumatic scotch yoke, electric multi-turn, or hydraulic emergency actuators.
Technical Specifications
Comprehensive operational standards and design parameters for ENGIPRO Trunnion Mounted Ball Valves.
Technical Details & Operational Standards
| Design Standards | ASME B16.34, API 6D, BS EN ISO 17292 |
| Special Features | One Piece, Two Piece, and Three-Piece Construction types • Fire-Safe Design • Anti-Blow Out Stem • Double block and bleed (DBB) feature • Low Operating Torque • Lip seals for low-temperature services • Stem extensions as required • Actuator mounting pads to ISO 5211 |
| End Flanges Compatibility | ASME B16.5, ASME B16.47 Series A & B, EN 1092-1 |
| Face to Face Dimensions | ASME B16.10, API 6D, BS EN 558 |
| Testing Standard | API 598, API 6D, ISO 5208 Rate A (Zero Leakage) |
| End Connections |
Raised Face Flange (ASME B16.5, EN 1092-1) Ring Type Joint (ASME B16.5 RTJ) Butt Weld (ASME B16.25) • Socket Weld |
| Size Range |
Floating type: DN 15 to DN 250 (1/2" to 10") Trunnion mounted (TMBV): DN 25 to DN 600 (1" to 24") |
| Pressure Rating |
Floating type: PN 10, PN 16, Class 150–2500 Trunnion mounted (TMBV): Class 150–1500 (PN 20 to PN 250) |
| Operations |
Manual: Bare-shaft, Heavy Lever & Enclosed Worm Gearbox Automation: Pneumatic Scotch Yoke, Electric Rotary, Electro-Hydraulic Actuators |
| Shutoff Rating | Zero Leakage for Soft Seated & Metal Seated as per API 6D or relevant STD. |
Material Type Specification & Service Metallurgy
| TYPE OF SERVICE | VALVE SHELL MATERIAL | PRESSURE CONTROLLING PARTS & STEM |
|---|---|---|
| General Service | Carbon or Low-Alloy Steel (ASTM A216 WCB, A105) | Carbon or Low-Alloy Steel (ENP Plated) |
| General Service | Carbon or Low-Alloy Steel (ASTM A352 LCC, LF2) | Stainless Steel (SS 304, SS 316, 17-4PH) |
| General Service | Stainless Steel (ASTM A351 CF8M, F316) | Stainless Steel (SS 316, SS 316L) |
| Sour Service (NACE MR0175) | Carbon or Low-Alloy Steel (A105 / WCB NACE) | Carbon or Low-Alloy Steel (NACE Heat Treated) |
| Sour Service (NACE MR0175) | Carbon or Low-Alloy Steel (LF2 / LCC NACE) | Stainless Steel (SS 316 / 17-4PH NACE certified) |
| Sour Service (NACE MR0175) | Stainless Steel (CF8M, F316, Duplex 2205) | Stainless Steel (SS 316, Duplex 2205) |
| Sour Service (Severe Corrosive) | CRA (Corrosion Resistant Alloy - Inconel 625, Hastelloy C, Monel) | CRA (Corrosion Resistant Alloy) |
Engineered for Critical Pipeline Infrastructures
Trunnion mounted ball valves provide secure Double Block and Bleed isolation across demanding industrial transport and storage networks.
Cross-Country Oil & Gas Pipelines
Mainline sectionalizing, scraper pig launcher and receiver traps, and custody transfer stations requiring certified API 6D zero-leakage DBB.
Refinery & Petrochemical Manifolds
Hydrocarbon blending manifolds, catalytic cracking feed headers, distillation columns, and chemical feedstocks requiring NACE MR0175 sour service compliance.
Tank Farms & Terminal Storage
Bulk petroleum storage tank isolation, truck loading racks, rail terminal loading arms, and automated emergency shutdown valves (ESDVs).
Offshore Platforms & FPSO Ships
Subsea risers, topside gas compression modules, wellhead flowlines, and seawater injection pumps requiring corrosion-resistant CRA and Duplex alloys.
Natural Gas City Gate & Regulating
High-pressure gas pressure reduction skids, gas metering skids, compressor stations, and underground storage facilities operating at ASME Class 600/900.
Power Plants & Utilities
Heavy fuel oil supply piping, cooling water headers, auxiliary steam distribution, and hydrogen coolant circuits requiring zero-cavity leakage.
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Need Custom Trunnion Ball Valves or Skid Automation?
Our technical engineers assist with breakaway torque sizing, MAST stem calculations, NACE compliance documentation, and full factory acceptance testing (FAT).