| 摘要 |
PURPOSE:To make the operating force to be generated optionally changeable by providing a constant-pressure chamber and a variable-pressure chamber which is freely communicated or cut off internally, both partitioned by a movable wall in a body, and dividing this variable-pressure chamber into two rooms with a bulkhead so that both rooms can be communicated or cut off by a one- way valve and a solenoid valve. CONSTITUTION:A body 11 internally divided into a constant-pressure chamber 16 and a variable-pressure chamber 17 by a movable wall 14 and a resin hub 15 is provided. a control valve 28 operated by an input rod 25 is stored in the hub 15 hermetically and slidably penetrating the body 11. The variable- pressure chamber 17 is cut off from the constant-pressure chamber 16 and, on the other hand, is communicated to the atmosphere by the operation of this control valve 28, thereby the operating force in response to the pressure difference is applied to the movable wall 14. In this case, the variable-pressure chamber 17 is divided into two variable-pressure rooms 17a, 17b by a bulkhead 21 provided in the body 11. Both variable-pressure rooms 17a, 17b can be communicated together via a one-way valve 22 made with an annular seal and a valve 24 closed by an input signal.
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