Working Principle Of Trunnion Mounted Plastic Ball Valves

  • Trunnion mounted plastic ball valve are quarter-turn valves. This means you need to turn the actuator on a 90-degree angle to turn the valve on or off. Once the actuator is turned the ball rotates so that the bore faces the pipeline and medium can flow freely. Another turn of the handle moves the ball so that the bore faces away from the pipeline stopping the flow.

    For example, you have to regulate the flow of oil through a critical process unit. You will install a three-piece, half-bore, split-body ball valve like SIO Trunnion Mounted Ball Valve to get the job done. To start the flow of oil, you will move the actuator on the valve 90 degrees one way (usually clockwise). The actuator is connected to the stem of the valve which in turn is connected to the ball. As the stem rotates it moves the ball as well so that the side of the ball with the bore faces the pipeline. Since this is a half-bore valve the flow of oil is restricted, lowering the pressure with which the stream flows.

    SIO trunnion mounted ball valve
    To stop the flow, you rotate the actuator again moving both the stem and the ball. The bore of the ball now faces away from the pipeline inhibiting flow. The upstream pressure on the valve pushes the seats closer to the ball so that they make a tight seal. Since the seats of a trunnion mounted ball valve are spring-loaded, even low pressures can push them against the ball. This tight seal stops the flow of oil and also prevents oil from getting into the internal parts of the valve.

    Trunnion mounted ball valves are used in both high-pressure and low-pressure applications. In high-pressure applications, the valve maintains its torque as any added pressure on the seats and ball is absorbed by the trunnion. In low-pressure situations, the valve’s spring-loaded seats move closer to the ball to form a firm seal.

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