The downstream seat is found on the opposite side of the upstream seat which is adjacent to the discharge side of the valve.
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When the valve is closed, the core is wedged against the seat, ensuring positive shutoff.
Rising stem ball valves incorporate tilt-and-turn operation, eliminating seal rubbing—one of the primary causes of valve failure.
Cavity-filled ball valves are easier to clean and maintain.
A flow upstream to the inlet of a multi-port valve can be split into multiple outlet streams.