"RDS416519" . "GATE VALVE" . "569300" . "The gate closure member shall be of one piece (i.e. wedge or slab) or constructed of two or more pieces (i.e. double disk). API 6D March 31, 1994, Sect. 4.1.1.a." . "u82237" . "Qualified" . . "2005.12.21" . "A valve that is a valve where the closure member is a gate or disc with a linear motion parallel, or nearly parallel, to the plane of flat seats, which are transverse to the direction of flow." . "GATE VALVE" .