| 摘要 |
PURPOSE:To control a large amount of fluid to be selected without causing a pressure rise, by simultaneously connecting one set of opposed pipe connection ports in a neutral position further continually connecting a port in a flow path with any of the pipe connection ports. CONSTITUTION:A valve unit 12, drilling two through holes crossing at right angles with each other while providing a partitioning plate 18 diagonally crossing with an axis in the central part where the axis of each through hole intersects, partitions the center. The valve unit, when it is placed in a neutral position on the half way where a flow direction of fluid is switched, is provided such that two flow paths 15, 16 are simultaneously opened for either one of two sets of pipe connection ports 17A, 17C or 17B, 17D oppositely facing on a straight line. A rotary four way type valve, if it connects a delivery pipe from a pump with one set of the connection ports linearly communicating at neutral time while a suction pipe of the pump with the other set, enables a delivery amount of fluid to be controlled by directly recirculating a part of delivery fluid to a side of the pump. |
