| 摘要 |
PURPOSE:To reduce the cost of a controller by interposing group selecting pilot changeover valves and pilot valves for each individual actuator in a circuit for feeding pressure to actuators, and pilot-operating these pilot valves of both types. CONSTITUTION:Group selecting pilot changeover valves 11 and 12 and pilot valves 13 and 14 for each individual actuator are interposed in a circuit for feeding pressure to actuators 1, 2, 3 and 4. The changeover valves 11, 12, 13 and 14 are pilot-operated by means of electromagnetic changeover valves 7, 8, 9 and 10 of both types. By this arrangement, the system of the electromagnetic changeover valve can be divided into two, that is, selecting changeover systems 7 and 8 and shifting electromagnetic changeover valve systems 9 and 10, these systems bearing respective functions. Therefore, the number of electromagnetic changeover valves to be used for shift-operating a plurality of double-acting actuators can be reduced to half, and hence the cost for the controller can be reduced. |
