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Home News Reduced Bore Trunnion Mounted Ball Valve: Reliable Solution for High-Pressure Pipeline Applications
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Introduction

In modern oil & gas, petrochemical, and industrial pipeline systems, Reduced Bore Trunnion Mounted Ball Valves are widely used due to their high pressure capability, stable operation, and excellent sealing performance.

Compared with floating ball valves, the trunnion mounted design provides additional ball support, reducing operating torque and improving reliability in large diameter and high-pressure applications.

J-VALVES specializes in manufacturing high-performance Reduced Bore Trunnion Mounted Ball Valves for demanding pipeline systems worldwide.

1. Structural Features of Reduced Bore Trunnion Ball Valve

A Reduced Bore Trunnion Mounted Ball Valve adopts a fixed ball structure supported by upper and lower trunnions.

Main features include:

  • Fixed ball design

  • Reduced flow passage diameter

  • High-pressure resistance

  • Low operating torque

  • Compact and robust structure

The trunnion support system minimizes the load transferred to the valve seats, improving sealing stability and extending service life.

2. Advantages of Reduced Bore Design

Compared with full bore ball valves, reduced bore designs offer advantages in specific applications:

  • Smaller valve size and weight

  • Lower manufacturing cost

  • Reduced installation space

  • Suitable for high-pressure pipeline systems

The optimized flow channel design maintains reliable performance while meeting pipeline operation requirements.

3. Reliable Sealing Performance

For critical pipeline applications, sealing reliability is essential.

J-VALVES Trunnion Mounted Ball Valves feature:

  • Double sealing seat design

  • Fire-safe structure

  • Anti-static protection

  • Emergency sealant injection system

These features help reduce leakage risks and ensure safe operation under demanding conditions.

4. Industrial Applications

Reduced Bore Trunnion Mounted Ball Valves are commonly used in:

  • Oil and gas transmission pipelines

  • Natural gas processing systems

  • Petrochemical plants

  • Power generation facilities

  • High-pressure industrial pipelines

They are especially suitable for applications requiring frequent operation and long-term reliability.

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

As a professional industrial valve manufacturer, J-VALVES provides customized ball valve solutions according to customer requirements.

Professional Engineering Capability

J-VALVES designs valves according to international standards, including:

  • API 6D

  • ASME B16.34

  • ISO 14313

Advanced Manufacturing Process

J-VALVES applies:

  • Precision machining technology

  • High-quality material selection

  • Professional assembly processes

  • Strict pressure and leakage testing

to ensure stable performance and long service life.

Conclusion

The Reduced Bore Trunnion Mounted Ball Valve provides an efficient solution for high-pressure pipeline applications requiring reliable isolation, low operating torque, and durable performance.

With professional manufacturing experience, advanced technology, and strict quality control, J-VALVES delivers high-performance trunnion mounted ball valve solutions for oil & gas, petrochemical, and industrial applications worldwide.

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Nominal Size: 1 inch / DN25, range 1/4 to 12 inch Pressure Class: ASME Class 150, 19.6 bar at 38°C; Class 300 optional Body Material: ASTM B148 C95800 nickel aluminum bronze Body Type: Two piece, bolted Ball: C95800, SS316 hard faced optional Stem: C95800 or SS316, blowout proof Seat: PTFE, RPTFE, PPL, or reinforced PTFE Packing: PTFE or graphite combined packing End Connection: Threaded NPT / BSPT, flanged RF to ASME B16.5 optional Service Temperature: -29°C to +150°C standard, +200°C high temperature version Seawater Velocity Limit: About 6 m/s clean, 4.5 m/s with sand Design Standard: API 608, ASME B16.34 Test Standard: API 598, ISO 5208 Operation: Lever standard, pneumatic or electric optional
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