| 摘要 |
PURPOSE:To shorten cycle time by arranging pilot seat type valves in paths for supplying a large quantity of working fluid, and employing a direction control valve for control of switching of its pilot pressure. CONSTITUTION:First, second and third pilot seat type valves 6, 7, 8 are coupled to respective paths for a liquid pressure motor 9 and a pump line 20, first port 12 of an injection cylinder 10 and a pump line 20, second port 14 and tank line 21. Opening/closing of the valves 6, 7, 8 is carried out through switching control of respective pilot pressure. A directional control valve 15 for carrying out switching control of only the pilot pressure can be constructed of a control valve having small flow and short switching time.
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