The downstream seat is found on the opposite side of the upstream seat which is adjacent to the discharge side of the valve.
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.