| 摘要 |
PURPOSE:To improve in- and out-flow rate of air considerably in an abnormal situation in on- or off-operation on a control valve for clutch brake by providing pressure switches for detecting pressure in the down stream side of each of two magnetic three-way valves which are connected in series previously. CONSTITUTION:In an air-line 2 communicating an air supply source and an air chamber of a cluthc brake 1, the 1st and the 2nd magnetic three-way valves 3, 4 are provided. further, in the down stream side of each of the valves 3, 4 that is, at the 2nd port each of the valves, pressure switches 5, 6 is so provided that operating conditions of the magnetic three-way valves are detected through the on-off states of the switch 5, 6, that is, through the pressures at the 2nd port of each of the valve 3, 4. Thereby, in- and out-flow rate of the air in on- and off-operation and in an abnormal situation on the clutch brake is made to attain high in comparison with usual double valve parallel flow, and, at the same time, since the whole structure is simple and the amgnetic three-way valves of low cost is usable, the cost of the cntrol valve is reduced. |
