| 摘要 |
A solenoid-operated flow-control valve includes a solenoid coil that burns out if energized continuously. The energized solenoid permits fluid to flow, while fluid flow is prevented when the coil is not energized. A thermostat is interposed in the coil circuit and arranged in thermal communication with the coil. While fluid is being allowed to flow, the thermostat heats up until it causes the flow to be interrupted. It then cools down until it again allows fluid flow. A cycling flow of fluid thereby results. A sticking thermostat fails safe because continuous energization of the coil causes it to burn out, thereby interrupting the flow of fluid.
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