| 摘要 |
<p>PROBLEM TO BE SOLVED: To hold a machine tool in a present state by means of a valve system when a component in the valve system have an incorrect operation caused by a trouble and the like. SOLUTION: A first passage is extendedly arranged between an inlet and an outlet, and a second passage is extendedly arranged between the outlet and a discharging outlet. A plurality of first valves arranged in the first passage are movable between an intermediate position where the first passage is partially opened and an energizing position where the first passage is opened, and between the intermediate position and a deenergizing position where the first passage is closed. A plurality of second valves arranged in a second passage are movable between an intermediate position where the second passage is partially opened and an energizing position where the second passage is closed, and between the intermediate position and a deenergizing position where the second passage is opened. A plurality of reset materials are selectively engaged with the plurality of first valves. When the plurality of reset materials are pressurized, the plurality of reset materials move the plurality of first valves to the deenergizing position. When one of the plurality of reset materials is stuck, the plurality of reset materials have stems for a stick prevention valve extended therein in order to prevent the operation of a control valve system.</p> |
