Trunnion mounted ball valve with wormgear

Trunnion mounted ball valve are a new generation of high-performance ball valves, suitable for long-distance pipelines and general industrial pipelines. Their strength, safety, and resistance to harsh environments have been specially considered during the design process. They are applicable to various corrosive and non-corrosive media. Compared with floating ball valves, when working, the force generated by the fluid pressure at the valve inlet on the ball is fully transmitted to the bearing, preventing the ball from moving towards the valve seat. Therefore, the valve seat does not bear excessive pressure. Thus, the torque of the fixed ball valve is small, the valve seat deformation is small, the sealing performance is stable, and the service life is long. It is suitable for high-pressure and large-diameter applications.

product details

Valve body structure

Trunnion mounted ball valve have two types of valve body structures: two-piece and three-piece. The middle flange is connected by bolts. The seal is made of enhanced polytetrafluoroethylene embedded in a stainless steel ring. A spring is set behind the steel ring to ensure that the valve seat is tightly attached to the ball, maintaining a seal. Both the upper and lower valve stems are equipped with PTFE bearings to reduce friction and make operation easier. An adjustment plate is set at the bottom of the small shaft to ensure the contact position between the ball and the sealing ring. Full bore: The valve flow hole diameter is consistent with the inner diameter of the pipeline to facilitate pipeline cleaning.

Performance advantage

1. Operation is effortless: The sphere is supported by upper and lower bearings, reducing friction and eliminating the huge sealing load caused by the imported pressure pushing the sphere against the sealing seat, which results in excessive torque.

2. Reliable sealing performance: The PTFE single-component material sealing ring is embedded in the stainless steel valve seat. The metal valve seat tail end is equipped with a spring to ensure sufficient preload for the sealing ring. When the sealing surface of the valve wears out during use, under the action of the spring, the valve continues to ensure good sealing performance.

3. Fireproof structure: To prevent the PTFE sealing ring from burning up due to sudden heat or fire and causing a large leakage that may intensify the fire, a fireproof sealing ring is set between the sphere and the valve seat. When the sealing ring burns out, under the action of the spring force, the valve seat sealing ring is quickly pushed onto the sphere, forming a metal-to-metal seal, achieving a certain degree of sealing effect. The fire resistance test meets the requirements of AP16FA and AP1607 standards.

4. Automatic pressure relief function: When the pressure in the valve chamber of the medium becomes abnormally high and exceeds the spring's preload, the valve seat retreats and detaches from the sphere, achieving the effect of automatic pressure relief. After the pressure is relieved, the valve seat automatically retracts.

5. Drainage pipeline: Both the upper and lower parts of the valve body are equipped with drainage holes. They can be used to check if there is any leakage at the valve seat. During operation, when the valve is fully open or fully closed, the pressure in the middle chamber is released, and the packing can be replaced directly; it can also discharge the accumulated substances in the middle chamber to reduce the pollution of the medium to the valve. Function

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