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Views: 1 Author: Site Editor Publish Time: 2020-07-28 Origin: Site
What are the characteristics of Trunnion Mounted Ball Valves
1. Labor-saving operation: the sphere is supported by the upper and lower bai bearings to reduce friction and eliminate the excessive torque caused by the huge sealing load formed by the imported pressure pushing the sphere and the sealing seat.
2. Reliable sealing performance: PTFE unisexual material sealing ring is embedded in the stainless steel valve seat, and 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 is worn during use, it will be under the action of the spring. The valve continues to ensure good sealing performance.
3. Fireproof structure: In order to prevent the PTFE seal ring from burning due to sudden heat or fire, large leakage occurs, and the fire is promoted, a fireproof seal ring is set between the ball and the valve seat. When the seal ring is burned, Under the action of the spring force, the valve seat sealing ring is quickly pushed onto 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-load of the spring, the valve seat will move backwards away from the sphere to achieve the effect of automatic pressure relief. After the pressure is relieved, the valve seat will automatically recover.
5. Drainage pipeline: The upper and lower valve body is equipped with a drain hole L, which can 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; it can be discharged Retention of the cavity reduces the pollution of the valve by the medium.