| 摘要 |
PROBLEM TO BE SOLVED: To provide an operation pattern switching valve small in size, simple in structure, and low in cost and a pilot pressure circuit thereof. SOLUTION: This pilot pressure circuit of an operation pattern switching valve allows the relation of pilot pressure circuit connection between two sets of four pilot valves 50a to 50d and 51a to 51d of a pair of right and left side operation levers and four different types of pilot pressure operated actuator control valves 52, 53, 54, and 55 to be switched in the relation of a plurality of connections. The pilot pressure circuit comprises pilot fluid input circuits 1 to 4 and 5 to 8, a pilot fluid branch input circuit, an operation pattern fluid output circuit installed so as to flow a pilot fluid to the four types of control valves according to the type of operation pattern, an operation pattern selector valve connecting the branch input circuits to the output circuits, and unified output circuits 11 to 18 obtained by connecting, to each other, the output circuits for a pilot fluid flowing through same types of control valves.
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