PURPOSE:To facilitate assembly and disassembly as well as eliminate leakage of fluid by furnishing the valve chest at its bottom with a plurality of flow paths, and by operating valve rods in a number corresponding to said flow paths by the use of a disc-shaped surface cam. CONSTITUTION:Flow paths 38-40 with the same circular profile are formed in a plurality of bent pipes 35, 36, 37, which are installed at the bottom surface of the lower body 32 and which stretch in three different directions. The center shaft 42 is screw-fixed to the center of the top surface of the upper body 31, and a disc-shaped surface cam 44 is installed at the upper part of said shaft 42 rotatably. The three valve rods 46 are arranged slidably in the vertical direction on each flow path 38-40 in its position mating with the opening part of the bottom surface 41a of valve chest 41.
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