| 摘要 |
PURPOSE:To make it possible to select operating methods of at least three specific companies by installing directional selector valves on pilot pipings witch connect each pilot valve and the pilot operating part of main directional selector valves. CONSTITUTION:Directional selector valves 24, 25,...32 are installed on pilot pipings 23A, 23B,...23H which connect eight pilot valves 21A, 21B, ...21H operated by two operating levers, making four valves one set, and pilot operating parts 22a, 22b,...22h of main directional selector valves operating each actuator. As for these directional selector valves 24, 25,...32, the directional selector valve 24 by way of example, directly connects pipings 23B and 23G at a non- changing over position (a), and at a changing over position (b) connects pipings 23B and 23G by replacing their inflow and outflow sides. Therefore, the operating method of operating levers can be changed over to three types by selectively changing over the directional selector valves 24, 25,...32 as the occasion may demand. |
