What are Trunnion Ball Valves?

Trunnion ball valves, an integral part of industrial systems, are specialized devices designed to regulate the flow of liquids or gases within a pipeline. They have a spherical disc, known as a ball, which has a hole through its center that acts as the passageway. The trunnion ball valve’s unique design allows it to control the flow by rotating the ball either parallel or perpendicular to the flow.

Design and Functionality of Trunnion Ball Valves

The trunnion ball valve is characterized by its special design, which includes a ball that is anchored at the top and bottom, known as the trunnion. This design ensures stability and reduces the load on the seats, which results in a lower operating torque and extended service life.

Working Mechanism

These valves operate by rotating the ball that is fixed in place by the trunnions. When the valve is in the open position, the hole aligns with the pipeline allowing fluid to flow through. Conversely, when the valve is closed, the hole is perpendicular to the pipeline, blocking the flow.

Ball Valve


Trunnion ball valves offer several advantages. Their fixed ball design reduces torque requirements, making them ideal for high-pressure applications. Furthermore, they offer tight sealing, which ensures zero leakage and makes them suitable for applications that require both high temperature and pressure.

Ball Valve

Applications of Trunnion Ball Valves

Due to their robust design and excellent sealing capabilities, trunnion ball valves find wide applications in various industries such as nuclear power, oil, chemical, shipbuilding, offshore, metallurgy, machinery, electricity, and more.

Nuclear Power Industry

In the nuclear power industry, trunnion ball valves are used in cooling systems to regulate the flow of coolant. Their high sealing capability ensures that there is no leakage of coolant, which can lead to serious safety issues.

Oil and Gas Industry

In the oil and gas industry, these valves are used in pipeline systems to control the flow of oil or gas. Their ability to withstand high pressures and temperatures makes them an ideal choice for this industry.

WLY Transmission: Your Trusted Provider of Trunnion Ball Valves

When it comes to high-quality trunnion ball valves, WLY Transmission stands out as a trusted provider. With a strong focus on quality, preferential pricing, and considerate services, WLY specializes in different kinds of high-pressure valves, valve manifolds, flanges, and fittings. Our products are largely applied in various industries, including nuclear power, oil, chemical, shipbuilding, offshore, metallurgy, machinery, electricity, and more.

At WLY, we are not only equipped with a complete set of manufacturing equipment but also possess the ability to provide personalized design, mold development, material molding and forging, CNC precision machining, metal surface treatment, and finished product comprehensive testing. Furnished with standards of ANSI / ASME, DIN, BS, JIS, GB, CB and other series, our products are designed to meet diverse industry needs. Additionally, we offer customizable services to meet our clients’ unique requirements.

Experience the quality, affordability, and exceptional service that only WLY Transmission can provide. Choose WLY for your trunnion ball valve needs today.

WLY Transmission factory



MAIL: [email protected]

Addr:  TieYe Road 9-13 Unit3-2-204

Related Products You May be Interested…