Valve

Trunnion Mounted Forged Steel Ball Valve

The trunnion mounted forged steel ball valve is typically used in medium to high pressure pipeline systems, especially where larger valve sizes or stable operation is required. The valve body and main pressure-retaining parts are manufactured from forged steel, providing consistent material structure and reliable mechanical strength for long-term service.

The ball is supported by upper and lower trunnions. Pipeline pressure is transferred to the valve body rather than the stem, which helps reduce operating torque and limits ball movement under changing pressure conditions. This structure is commonly selected for higher pressure classes or frequent operation.

Seat design and sealing materials can be selected based on actual service conditions. Both soft-seated and metal-seated configurations are available depending on temperature, media, and wear requirements.

Product Description

The trunnion mounted forged steel ball valve is typically used in medium to high pressure pipeline systems, especially where larger valve sizes or stable operation is required. The valve body and main pressure-retaining parts are manufactured from forged steel, providing consistent material structure and reliable mechanical strength for long-term service.

The ball is supported by upper and lower trunnions. Pipeline pressure is transferred to the valve body rather than the stem, which helps reduce operating torque and limits ball movement under changing pressure conditions. This structure is commonly selected for higher pressure classes or frequent operation.

Seat design and sealing materials can be selected based on actual service conditions. Both soft-seated and metal-seated configurations are available depending on temperature, media, and wear requirements

Design Notes

The valve operates with a 90-degree quarter-turn.
The trunnion-mounted structure keeps the ball in a fixed position, improving control and stability compared with floating ball designs, particularly in larger sizes.
Seat assemblies may include spring-loaded or pressure-assisted designs to maintain sealing performance under varying pressure conditions.

Main Specifications (Reference)

• Size Range: b>DN50 – DN600

• Pressure Rating:b> Class 150 – Class 2500

• Body Material: A105, F11, F22, F304, F316, duplex stainless steel

• Ball Type: Trunnion mounted (fixed ball)

• End Connection: Flanged, butt weld

• Operation: Manual, gearbox, pneumatic, electric

Typical Applications

Suitable for medium to high pressure pipelines, larger diameter systems, and services where stable operation and reliable sealing are required. Commonly used in oil & gas, chemical processing, power generation, and general industrial piping systems.

Notes

Trunnion mounted forged steel ball valves are generally selected when floating ball designs are not suitable due to pressure level, valve size, or operating conditions. Final configuration should be determined based on actual service requirements and project specifications.