"2005.12.21" . "569500" . "A rotary valve that has a closure member of a disc type with a shaft parallel, or near parallel, to the plane of the disc, with an axis of rotation transverse to the flow direction." . "u82237" . "RDS416609" . "Qualified" . "A type of quick opening valve where the closure member has the shape of a disc that pivots on a shaft in the throat of the valve." . "BUTTERFLY VALVE" . . "BUTTERFLY VALVE" .