Views: 0 Author: J-VALVES Publish Time: 2024-05-29 Origin: Site
The core design of the trunnion ball valve is to fix the ball in the valve body through the trunnion, and the ball will not move towards the valve seat during the operation. This design significantly reduces the load on the valve seat, enabling the valve to operate stably under high-pressure conditions.
The trunnion structure usually includes top and bottom bearings. These bearings can bear the weight of the ball and fluid pressure, ensuring the stability of the ball and the flexibility of operation.
Low operating torque: Due to the reduced friction between the ball and the valve seat, the operating torque of the trunnion ball valve is low, and it can be easily operated even under high pressure.
High reliability: The trunnion structure can effectively prevent the ball from moving towards the valve seat under high pressure, thus avoiding valve seat deformation and seal failure and extending the service life of the valve.
Double block and bleed function: Many trunnion ball valves are designed with a double block and bleed (DBB) function, allowing isolation and bleeding of the pressure on both sides when the valve is closed, improving the safety of the system.
Stainless steel is one of the most commonly used valve body materials for trunnion ball valves, featuring good corrosion resistance and strength.
316 stainless steel is one of the most widely used grades, performing excellently in corrosive media such as seawater and acidic environments.
Alloy Steel
For high-temperature, high-pressure or highly corrosive media, alloy steel is a better choice.
Alloy 400 is a commonly used nickel-based alloy, with excellent corrosion resistance and high-temperature performance.
Carbon Steel
Carbon steel is suitable for non-corrosive media or cost-sensitive applications.
Carbon steel has high strength, but its corrosion resistance is relatively poor, and surface treatment is usually required.
PTFE (Polytetrafluoroethylene)
PTFE is a general-purpose valve seat material, with good chemical corrosion resistance and a low coefficient of friction.
However, its performance will decline at high temperatures, so it is suitable for low-temperature working conditions.
