Rotary, segmented, expansible valves

A valve including a body having a fluid passage and a body opening intersecting said passage, said body opening being defined by an encompassing body wall, a valve member rotatably mounted in said body opening and divided into four expansible segments, two of said segments being opposed and forming one opposed pair, the other two of said segments being opposed and forming another opposed pair, said valve member having an opening to register with said fluid passage, said valve member opening extending through one opposed pair of said segments, the other opposed pair of said segments being solid and forming fluid stops when registered with said fluid passage, a tube lining said valve member opening, said one pair of opposed segments being slidably mounted on said tube, fluid sealing means for sealing each segment of said one opposed pair of segments with respect to said tube, means for rotating said valve member to register said valve member opening with said fluid passage in the open condition of said valve and to register said other pair of solid valve member segments with said fluid passage in the closed condition of said valve, valve seats surrounding said fluid passage on opposite sides of said valve body opening means for selectively expanding said opposed pairs of expansible valve member segments outwardly within said body opening into sealing contact with said valve seats.