| 摘要 |
A control element, for the pneumatic establishment of logical connections, includes two coaxially arranged mutually interconnected diaphragms whose surfaces facing toward each other as well as whose surfaces facing away from each other can be subjected to a pressure medium. The diaphragm surfaces facing toward each other are the alternately acting switching elements of a three-way branch connection. Connecting rods interconnect the two diaphragms and extend through bores in the housing of the control element, and the diaphragms have relatively rigid plates secured thereto. A conical coil spring biases the two diaphragms to one position when no fluid pressure is effective on the control element. The active surfaces of the diaphragms subjected to a pressure medium are of substantially equal size. The control element includes a housing and a pair of covers which conjointly define diaphragm chambers connected to flow channels in the covers. Either of two inputs or outputs in the body may be connected to a third input or output by displacement of the diaphragms in one direction or the other.
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