| 摘要 |
PROBLEM TO BE SOLVED: To operate a garbage box at a low speed without malfunction with the simple constitution by a garbage box dumping directional control valve. SOLUTION: A hydraulically switching inside passage 23 is arranged on one end side of a garbage box dumping spool. An inflow passage 23 is formed in a small diameter as an orifice. A hydraulically switching peripheral groove 24 and a pressure relief passage 25 are provided on the other end side. A hydraulic fluid leaked from left and right P ports flows out of a tank port by passing through passages 23 and 25 in an illustrated neutral position. When moving the hydraulically switching spool rightward, the inside passage 23 becomes P→A, and the peripheral groove 24 becomes B→T. When moving the spool leftward, the inside passage 23 becomes A→T, and the peripheral groove 24 becomes P→B. Since oil passes through the inflow passage 23a as the orifice in either case, quantity is squeezed so that the garbage box moves at a low speed.
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