Name: Forged Steel Trunnion Ball Valve
Brand: Relia
SKU: 00286
Rating: 5.0 (204 reviews)

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.

·Forged Steel:

Forged steel body and trim allow its application of high pressure, temperature and big sizes.

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.

double block and bleed trunnion mounted ball valve drawing

Double block
cut the flow from both upstream and downstream

double block and bleed trunnion mounted ball valve-2

Bleed
automatic cavity pressure relief mechanisms

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.