The trunnion mounted ball valve is a type of valve specially designed for large-diameter pipelines. Its structural feature is that the ball is supported by trunnions inside the valve body. This design provides higher stability and reliability, making it suitable for high-pressure and high-flow pipeline systems. Trunnion mounted ball valves are widely used in petroleum, natural gas, chemical engineering, electric power and other fields.
Working Principle of Trunnion Mounted Ball Valves
The working principle of a trunnion mounted ball valve is based on a rotating ball to control fluid flow. When the valve is opened or closed, the ball rotates to open or close the fluid passage. Since the ball is supported by trunnions, it can withstand higher pressure without being easily deformed or damaged, which makes the trunnion mounted ball valve highly reliable when handling high-pressure fluids.
Main Structure
Valve Body: Serves the functions of support and sealing.
Ball: Controls fluid flow, usually made of stainless steel or other corrosion-resistant materials.
Trunnions: The structure that supports the ball and ensures its stable rotation inside the valve body.
Sealing System: Available in two options—soft sealing and metal sealing—both capable of effectively preventing leakage.
Actuator: Electric or pneumatic actuators can be selected as needed to control the opening and closing of the valve.
Advantages of Trunnion Mounted Ball Valves
High Stability and Durability
With its unique design, the trunnion mounted ball valve can withstand high pressure and high flow, making it particularly suitable for pipeline systems under extreme working conditions. Its ball support structure enhances the valves stability and extends its service life.
Double Sealing System
Equipped with double sealing technology, including double block and bleed (DBB) sealing. It can effectively prevent leakage even under extreme conditions, ensuring system safety.
Fire-Safe Design
Trunnion mounted ball valves usually feature a fire-safe design, which ensures that the valve can continue to work normally in high-temperature or fire conditions, preventing the spread of fire.
Multiple Sealing Options
Offering two choices—soft sealing and metal sealing—it can provide the optimal sealing effect according to the requirements of different working conditions.
Maintenance and Servicing of Trunnion Mounted Ball Valves
Regular Sealing Performance Inspection
Inspect the valve's sealing performance on a regular basis to ensure there is no leakage. If a leakage issue is detected, repair or replace the sealing components immediately.
Cleaning and Lubrication
Keep the valve clean to prevent impurity accumulation that may affect its normal operation. Lubricate the ball and bearings periodically to reduce wear and tear.
Actuator Inspection
If an electric or pneumatic actuator is used, check the actuator’s working status regularly to ensure its flexibility and reliability.
Application Fields of Trunnion Mounted Ball Valves
Trunnion mounted ball valves are widely used in industrial occasions requiring high pressure and high flow rates. Here are some typical application fields:
Oil and Gas Industry: During the exploration, transportation and storage of oil and natural gas, trunnion mounted ball valves are used to control fluid flow and ensure the efficient operation of the system.
Chemical Industry: In chemical production processes, trunnion mounted ball valves can effectively control the flow of various chemical substances and guarantee production safety.
Power Industry: They are applied in high-pressure steam and cooling water systems of power plants to ensure the stable control of fluids.
Drinking Water Treatment: Some trunnion mounted ball valves adopt FBE coating technology, which can be used in drinking water treatment systems to prevent corrosion and ensure water quality safety.
