| 摘要 |
PROBLEM TO BE SOLVED: To solve a problem in a conventional valve functioning as a selector valve by combining check valves, in which since movable valve elements having a check function are provided independently in a valve body block and the movable valve elements are controlled by pilot pressure utilizing differences in respective pressure receiving areas, the number of the movable valve elements is large, which leads to large dimensions and heavy weight of the valve body block and high precision boring processes corresponding to the movable valve elements are required, which leads to high manufacturing costs. SOLUTION: This device has a double structure that a large movable valve element 2 contains a small valve element 3, providing a function equivalent to that of two movable valves by operating pilot pressure selector valves 7A and 7B. Reducing the movable valve elements lessens the dimensions and the weight of the valve body block, and boring processes requiring accuracy are reduced half in the number, which leads to lower manufacturing cost. COPYRIGHT: (C)2003,JPO
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