Flanged Trunnion Mounted Ball Valves

Flange trunnion ball valve is a valve in which the opening and closing part (ball) is driven by the valve stem and rotates around the axis of the valve stem. This valve is usually used to control the flow of fluid in the pipeline and can be opened or closed by rotating 90 degrees.

‌Main structure‌

‌Valve body and ball: The valve body is mostly made of cast steel (WCB), stainless steel (304/316L) or forged steel, and the surface of the ball is hard alloy surfacing to enhance wear resistance.
The ball is fixed by upper and lower bearings to prevent the medium pressure from pushing the ball to move and reduce the operating torque.
‌Sealing components‌:
‌Dual valve seat design: Two independent valve seats are located on both sides of the ball, supporting bidirectional sealing and medium isolation.
‌Fireproof structure‌: In the event of a fire, the fireproof sealing ring forms a metal seal with the ball, which complies with the API 607 ​​standard.

 

Flanged Trunnion Mounted Ball Valves

 

Applications
Long-distance pipelines: large-diameter (DN600+) oil and gas, water pipelines, suitable for high-pressure environments above Class 600.
Petrochemical: high-pressure reactors, high-temperature steam pipelines and corrosive media control.
Industrial equipment: boiler systems, particle-containing slurry transportation and fire protection pipelines.
Selection and maintenance recommendations

Selection points
High-pressure scenarios: Forged steel valve body + hard seal (such as Stellite alloy) is preferred.
Corrosive media: 316L stainless steel valve body + fluororubber seal ring.
Fire protection requirements: Fire protection seal ring design must comply with API 607 ​​standards.
Maintenance recommendations
Regular lubrication: Inject high-temperature grease into the valve stem and bearing every 6 months to prevent jamming.
Seal detection: Check the valve seat wear every year under high-pressure conditions and replace the spring or seal ring in time.

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