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Home News Trunnion Mounted Ball Valve Technology Overview: Enhancing Fluid Control Solutions for Industrial Applications
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Trunnion mounted ball valves serve as key components in the field of fluid control, and are widely used in various industries such as petroleum, natural gas, chemical processing, electric power, and water treatment. Characterized by their unique design, these valves can withstand high-pressure and high-flow operating conditions, making them particularly suitable for applications requiring superior sealing performance and durability. This article will delve into the technical features, application fields, and selection recommendations of trunnion mounted ball valves.

Working Principle of Trunnion Mounted Ball Valves

The core feature of trunnion mounted ball valves lies in their trunnion structure. Unlike traditional floating ball valves, the ball of a trunnion mounted ball valve is fixed on both sides of the valve via support bearings. This design allows the ball to rotate stably inside the valve cavity without being affected by fluid pressure. The ball is typically machined with a circular bore; by rotating the ball, the passage of fluid can be precisely regulated or shut off.

This structural design offers several distinct advantages. Especially in high-pressure and high-flow operations, trunnion mounted ball valves deliver more stable and reliable sealing performance.

Application Fields of Trunnion Mounted Ball Valves

Trunnion mounted ball valves are suitable for a wide range of complex fluid control environments, with common applications including but not limited to:
  • Oil and Gas Industry: Utilized in oil extraction, oil transportation, and natural gas transmission pipelines to provide highly reliable sealing and flow control.

  • Chemical Industry: Assist in controlling and regulating fluid flow during chemical reactions to ensure the safety of the reaction process.

  • Electric Power Industry: Employed in power plants to control the flow of steam and cooling water, guaranteeing the efficient operation of equipment.

  • Water Treatment: Effectively regulate water flow in water treatment facilities to maintain the stability of water supply systems.

Technical Advantages of Trunnion Mounted Ball Valves

  • High Reliability and Durability: Thanks to their unique structural design, trunnion mounted ball valves can withstand higher pressure and larger flow rates, making them ideal for heavy-duty and harsh industrial environments.
  • Precise Fluid Control: By precisely adjusting the rotation angle of the ball, high-accuracy flow control can be achieved, catering to complex process requirements.

  • Reduced Friction and Wear: With the ball fixed by support bearings, this design significantly reduces friction and wear compared to traditional floating ball valves, thereby extending the service life of the valve.

  • Easy Maintenance: Compared with other valve types, trunnion mounted ball valves feature relatively simple maintenance. Their stable structure is less prone to damage or leakage, resulting in lower maintenance costs.

How to Select the Right Trunnion Mounted Ball Valve

When selecting a trunnion mounted ball valve, users need to consider the following key factors:
  • Pressure and Temperature Requirements: Determine the maximum working pressure and temperature that the valve can withstand to ensure stable operation under the required working conditions.

  • Medium Type: Different fluids impose varying requirements on valve materials. For instance, corrosive fluids require corrosion-resistant materials (such as stainless steel).

  • Size and Flow Rate: Select the appropriate valve size based on pipeline dimensions and fluid flow requirements to ensure the accuracy of flow control.

  • Operation Mode: Consider whether manual operation, pneumatic control, or electric control is required, and choose the most suitable actuation method accordingly.

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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