| 摘要 |
The invention relates to a device adapted to reliably operate solenoids controlling valves at long distances from a central control station thereby enabling the use of light weight electrical cable between the control station and the solenoid, the device including a capacitor and a switching arrangement enabling current stored by the capacitor to be supplied to the solenoid to activate the solenoid, power being supplied to the capacitor from the central control station.
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