GMK Cast Steel Trunnion Mounted Ball Valve

Working Principle of Trunnion Mounted Ball Valve from a Professional Manufacturer

The working principle of a trunnion mounted ball valve is based on a 90-degree quarter-turn operation.

The ball is supported by the upper stem and lower trunnion, allowing smooth rotation between the fully open and fully closed positions.

When the valve is opened, the bore of the ball aligns with the pipeline, allowing fluid to pass with minimum pressure loss.

When the valve is closed, the ball rotates 90 degrees and blocks the flow passage, providing reliable shut-off performance.

The trunnion support system absorbs pressure forces from the pipeline, reducing operating torque and making the valve suitable for manual, pneumatic, hydraulic, or electric actuator operation.

Benefits of Our Trunnion Mounted Ball Valve Solutions

Low Torque Performance of Trunnion Mounted Ball Valve

One of the main advantages of a trunnion mounted ball valve is its low operating torque.

Because the trunnion supports the ball and absorbs pipeline pressure forces, less energy is required to operate the valve compared with conventional floating ball valves.

Benefits include:

Smaller actuator requirements
Lower operating costs
Easier automation
Improved operating efficiency

Reliable Sealing Performance of Industrial Trunnion Mounted Ball Valve

A high-quality trunnion mounted ball valve provides stable sealing performance in both upstream and downstream directions.

The spring-loaded seat design maintains continuous contact between the seat and ball surface, compensating for pressure changes during operation.

This design ensures reliable sealing performance under:

High-pressure conditions
Low-pressure conditions
Zero-pressure situations

For critical pipeline systems, double block and bleed (DBB) functionality can provide additional safety and maintenance advantages.

Long Service Life and Reduced Wear

The fixed ball structure reduces unnecessary movement between the ball and seats.

As a result, the valve experiences less seat wear and provides longer service life compared with traditional floating ball valve designs.

This makes trunnion mounted ball valves suitable for continuous operation in demanding industries such as:

Oil and gas
Petrochemical
Chemical processing
Energy production

High Pressure Pipeline Applications

The trunnion mounted ball valve design is specially developed for high-pressure applications where reliable isolation and safe operation are required.

The trunnion support prevents excessive ball movement caused by pipeline pressure, ensuring stable operation and dependable shut-off performance.

Typical applications include:

Oil transmission pipelines
Natural gas systems
Refinery facilities
Petrochemical plants
LNG projects
Energy infrastructure