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Gayle Tate: Trunnion Ball Valves are a type of valve which use a ball to control the flow. The ball is located on an arm mounted in a socket at the end of a vertical shaft.ewom valve A trunnion ball valve is a type of valve which uses a ball to control the flow. The ball is located on an arm mounted in a socket at the end of a vertical shaft. These valves are designed for use in applications where high purity, low pressure, and heavy liquid or gas loads are required. They are also good for process applications that require little or no maintenance.

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