Oswal Industries Ltd. Offers Trunnion Mounted Ball Valve. Oswal Industries Ltd. Has been awarded ISO 9001:2000 certifications. Trunnion Mounted Ball Valve has the ball which rotates without moving on the horizontal axis, where as seats are floating and free to move on the same axis. With the rise in pressure, the force on the seat ring by the pressure of Trunnion Mounted Ball Valve pushes towards the ball giving `bidirectional` sealing. Thrust due to fluid pressure and spring both on the upstream and downstream, pushes seat ring of this valve towards the ball for positive sealing under all conditions. When the valve is in closed position, the fluid trapped in the body cavity is subjected to thermal expansion and the valve cavity pressure increases. The excessive pressure buildup within the valve cavity is relieved automatically when the pressure inside exceed the spring load on the seat. Internal trunnion reduces the chance of fluid leakage to the atmosphere as in the case of external trunnion mounted ball valves.
