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Trunnion Mounted Ball Valves


The trunnion mounted ball valve is suitable for oil & gas pipelines and general industrial pipelines. Its strength, safety, and harsh environment resistance have been specially considered in the design, and it is suitable for various corrosive and non-corrosive media. Compared with the floating ball valve, the force generated by the fluid pressure in front of the valve on the ball is all transmitted to the bearing, and the ball will not move to the valve seat, so the valve seat will not bear excessive pressure.


1. Labor saving

The ball is supported by the upper and lower bearings to reduce friction and eliminate the excessive torque caused by the huge sealing load formed by the imported pressure pushing the ball and the sealing seat.

2. Reliable sealing performance

The sealing ring of resilient material is embedded in the stainless steel valve seat. The end of the metal valve seat is equipped with a spring to ensure sufficient pre-tightening force of the sealing ring. When the sealing surface of the valve wears during use, the valve will continue to ensure good sealing performance under the action of the spring. 

3. Fireproof structure

In order to prevent the PTFE seal ring from being burnt due to sudden heat or fire, causing a large leak, which will encourage the fire, a fireproof seal ring is set between the ball and the valve seat. When the seal ring is burned out, under the action of spring force , The valve seat sealing ring is quickly pushed to the ball to form a metal-to-metal seal, which has a certain degree of sealing effect. The fire resistance test meets the requirements of AP16FA and API607 standards.

4. Automatic pressure relief function

When the pressure of the stagnant medium in the valve cavity rises abnormally and exceeds the pre-stress of the spring, the valve seat retreats from the sphere to achieve the effect of automatic pressure relief. After the pressure is relieved, the valve seat automatically recovers.

5. Drainage pipeline

The upper and lower valve body are equipped with drain holes to check whether the valve seat is leaking. During work, when the valve is fully open or fully closed, the pressure in the middle cavity can be removed, and the packing can be directly replaced; the residual material in the middle cavity can be discharged to reduce the medium Contamination of the valve.

Major Specification

Nominal size: 1/2"~42"(DN25~DN600)

Nominal pressure: Class150~2500(PN10~PN420)

Standard: ISO17292, ASME B16.34,API608, API6D,

Body material:WCB, WC6, WC9, LCB, LCC, C5,C12, CF8, CF8M, CF8C, bronze, Inconel, monel

End connection:FF, RTJ, RF