| 摘要 |
The switching valve of a quick-operating slider system is an electrically operated stop valve. In the case of a required rapid shutoff, the coil ( 19 ) must be de-energized in a very short period of time in order to allow the switching valve ( 18 ) to open. For this purpose, a voltage-dependent resistor ( 33 ) is provided between the voltage source ( 25 ) and the coil ( 19 ), said resistor ( 33 ) having a high resistance below a switching voltage (U<SUB>s</SUB>), but a negligibly small resistance above the switching voltage. An auxiliary voltage source ( 35 ) is connected in parallel to the coil ( 19 ), the voltage of said auxiliary voltage source ( 35 ) being opposite to that of the voltage source ( 25 ). In this manner, the switching valve is rapidly opened both when a corresponding signal is received and in the case of power failure.
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