Trunnion Mounted Ball Valve

Design and Mechanism

• Trunnion Support:

In a trunnion ball valve, the ball is fixed by trunnions at the top and bottom, absorbing mechanical stresses and preventing displacement under pressure.

• Sealing System:

In high-pressure conditions, the fluid pressure reinforces the seal by pushing seats against the ball. In low pressure, springs ensure consistent contact between the seat and ball.

• Stem and Actuation:

The stem rotates the ball (90°), with reduced torque due to trunnions bearing axial loads, minimizing wear on the stem and seats.

Key Features and Advantages:

• ·Tight Sealing:

The ball is securely held in place by the trunnions, preventing movement and ensuring a tight seal. 

• Consistent Sealing:

Spring-loaded seats maintain sealing without reliance on system flow pressure, ensuring reliability even at <150 psi

• High-Pressure Applications:

The trunnion design is well-suited for high-pressure environments, as the additional support prevents the ball from being forced out of position.

• Durability:

Trunnion mounted ball valves are designed for demanding industrial environments, capable of handling high-pressure and high-temperature conditions.

• Lower Torque:

The trunnion and stem absorb any additional pressure on the valve, leading to lower operating torque and potentially eliminating the need for a large actuator.

• Double Block and Bleed Function:

Trunnion mounted ball valve features a double block and bleed function, allowing for independent shut-off of the line fluid on both sides of the ball.

• Fire-Safe Design:

Trunnion mounted ball valve is designed with fire-safe features, including anti-static systems and anti-blowout stems.

• Cavity Pressure Relief:

To prevent damage to valve seats and ball due to over-pressurisation inside the cavity, trunnion-mounted ball valves are equipped with automatic cavity pressure relief mechanisms.

Trunnion Mounted Ball Valve Drawing

Material Specifications

*Recommended Spare Parts