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Introduction

In oil & gas, petrochemical, LNG, and industrial pipeline systems, valves must provide reliable shut-off performance under high pressure and demanding operating conditions. The Trunnion Mounted Ball Valve is widely used in these applications due to its strong structure, low operating torque, and excellent sealing reliability.

Compared with floating ball valves, trunnion mounted ball valves use a fixed ball supported by upper and lower stems, making them especially suitable for large diameter and high-pressure pipeline systems.

J-VALVES specializes in manufacturing high-performance Trunnion Mounted Ball Valves designed for critical industrial applications worldwide.

1. Structural Features of Trunnion Mounted Ball Valve

A Trunnion Mounted Ball Valve uses a fixed ball design where the ball is supported by trunnions instead of being pushed directly by pipeline pressure.

Main features include:

  • Fixed ball support structure

  • Reduced operating torque

  • Double piston effect seat design

  • Reliable sealing performance

  • Suitable for high pressure and large diameter applications

This design reduces the load transferred to the valve seats, improving valve durability and service life.

2. Advantages for High Pressure Applications

For high-pressure pipeline systems, valve stability is extremely important.

The trunnion mounted design provides:

  • Better pressure resistance

  • Lower actuator requirements

  • Improved operational reliability

  • Reduced seat wear

It is commonly used in:

  • Oil and gas transmission pipelines

  • Natural gas systems

  • Refinery facilities

  • Power and chemical industries

3. Reliable Sealing Performance

Trunnion mounted ball valves are designed with advanced sealing technology to achieve dependable shut-off.

Key advantages include:

  • Low leakage performance

  • Fire-safe design

  • Anti-static structure

  • Emergency sealant injection system

These features help maintain safe operation in demanding environments.

4. J-VALVES Advantages in Trunnion Mounted Ball Valve Manufacturing

As a professional industrial valve manufacturer, J-VALVES provides customized trunnion mounted ball valve solutions for global customers.

Professional Design Capability

J-VALVES trunnion mounted ball valves are designed according to international standards, including:

  • API 6D

  • ASME B16.34

  • ISO 14313

High-Quality Manufacturing

J-VALVES applies advanced manufacturing processes, including:

  • Precision machining

  • Professional assembly

  • Pressure testing

  • Seat leakage testing

to ensure stable performance and long service life.

Customized Solutions

J-VALVES provides different configurations according to customer requirements:

  • Carbon steel and stainless steel materials

  • Different pressure classes

  • Manual or actuated operation

  • Cryogenic and special service designs

Conclusion

The Trunnion Mounted Ball Valve is an ideal solution for high-pressure and large-diameter pipeline applications. With strong mechanical support, low operating torque, and reliable sealing performance, it provides safe and efficient flow isolation for critical industries.

With advanced manufacturing technology and strict quality control, J-VALVES delivers reliable trunnion mounted ball valve solutions for oil & gas, LNG, petrochemical, and industrial pipeline systems.

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Size Range: 2 to 56 inch (DN50 to DN1400) Pressure Class: ASME Class 150 to 2500 / PN20 to PN420 Body Material: WCB, LCB, CF8, CF8M, CF3M, duplex, alloy steel Ball: Stainless with hard chrome, ENP, Stellite or tungsten carbide overlay Seat: PTFE, RPTFE, PPL, or metal Stellite faced Seat Arrangement: SPE, DPE (DIB-1), or combination (DIB-2) Packing: Live loaded graphite, ISO 15848-1 qualified Fire Test: API 607, also API 6FA and ISO 10497 Fugitive Emission: ISO 15848-1 class B or A, with temperature and cycle class stated Face to Face: ASME B16.10 short or long pattern End Connection: Flanged RF / RTJ to B16.5 and B16.47, butt weld to B16.25 Features: Double block and bleed, sealant injection, anti-static, anti-blowout stem Design Standard: API 6D, API 608, ASME B16.34, ISO 14313 Operation: Lever, gear, pneumatic, electric, hydraulic, gas over oil Sour Service: NACE MR0175 available
Nominal Size: 1-1/2 inch / DN40 Pressure Rating: 1000 WOG (68.9 bar cold working, non-shock) Body Type: Three piece, bolted end caps, four body bolts Body Material: ASTM A351 CF8 (304), CF8M (316) optional Ball: CF8, polished Ra 0.4 µm, full or reduced bore Seat: PTFE, RPTFE, PPL, or Stellite faced metal Body Gasket: PTFE to 180°C, graphite above Packing: PTFE V-ring to 200°C, graphite above End Connection: NPT, BSP, socket weld B16.11, butt weld B16.25, flanged RF Actuator Mounting: ISO 5211 F05 / F07 pad Air Supply: 0.4 to 0.7 MPa clean dry air Service Temperature: -29°C to +260°C, seat dependent Design Reference: MSS SP-110 general purpose, ASME B16.34 body wall Test Standard: API 598, ISO 5208
Nominal Size: 3/4 x 1/2 inch (DN20 x DN15), reduced bore Pressure Class: ASME Class 600 / PN100, 102.1 bar at 38°C Body Material: ASTM A182 F51 forged duplex, UNS S31803 PREN: Approximately 35 Ball: F51 with HVOF tungsten carbide or Stellite overlay Stem: F51, SS316 or 17-4PH, blowout proof Seat: RPTFE, Devlon, PEEK, or Stellite faced metal Bolting: B8M Class 2, alloy 718, or B7M for sour service End Connection: NPT, BSP, socket weld ASME B16.11, butt weld ASME B16.25 Bleed Port: Cavity bleed with plug or needle valve, lockable option Service Temperature: -29°C to +300°C, seat dependent Design Standard: API 6D, API 608, ASME B16.34 Test Standard: API 598, ISO 5208, cavity test through bleed port Sour Service: NACE MR0175 available