When Should I Use A Trunnion Ball Valve?

Trunnion-mounted ball valves is suitable for:
High-pressure applications
Trunnion-mounted ball valves adopts a trunnion (mechanical anchoring system) to ensure the ball's position and distribution of thrust of the pipe to prevent excessive friction between the ball and seat under high pressure. This reduces operating torque and extends service life. For example, in high pressure pipelines for petrochemical and natural gas transportation, ball valves mounted on trunnion-mounted ball valves can reliably withstand extreme pressure to ensure sealing performance.
Large diameter pipe
Floating ball valves produces high operating torque in high pressure or large diameter applications. Trunnion-mounted ball valves has a fixed ball design, which greatly reduces the torque required to open and close, and is more suitable for large diameter pipes (e.g. NPS8 and above). For example, in fluid control in power plants or large metallurgical equipment, ball valves mounted on engines can easily handle high flows.
High temperature or corrosive media environments
Trunnion-mounted ball valves typically use metal sealing structures steel seats, steel seats and high-temperature lubrication components to make them suitable for high temperatures (e.g. 800°C) or corrosive media (e.g. acidic or alkaline solutions). For example, in a catalytic cracking pipeline at a oil refineries, cylindrical spherical valves attached to the pipeline can reliably control high-temperature hydrocarbon media.
Applications requiring bidirectional sealing
Trunnion-mounted ball valves can be equipped with DBB (double seat exhalation) or DIB (double isolation) seats for bidirectional sealing. The DIB configuration prevents leakage and drains media from the valve cavity, protecting equipment from damage if sand or abrasive is present in the process fluid. For example, in clean pipelines in the pharmaceutical or food industry, DIB trunnion-mounted ball valves ensure zero leakage risk.
Key Application or Automatic Control Requirements
Trunnion-mounted ball valves support remote-controlled electric, pneumatic, or hydraulic actuators for applications requiring high reliability, such as cooling systems for nuclear power plants. Their low friction design reduces the load and failure rate of the actuator. In fuel delivery systems in the aerospace industry, for example, ball valves mounted on engines can precisely control the direction of fluid flow.
Applications that require low operating torque
Trunnion-mounted ball valves uses bearings to support the ball and reduce friction during opening and closing, especially in frequently operated situations (e.g., city gas pressure regulation stations. Compared with floating ball valve, it can reduce operating torque by 30%-50% and prolong the service life of the actuator.