| 摘要 |
<p>A gas control has a safety valve for stopping the flow of gas from an inlet to an outlet when an electromagnet, connected to a thermocouple heated by a flame produced by gas flow through the safety valve, is de-energized to allow an armature to move away from the electromagnet. A lever means connecting the safety valve and the armature has a latching means which can be unlatched upon movement of a manual control knob to an off position to allow the safety valve to close even though the electromagnet is still energized by a hot thermocouple. If the manual control knob is turned on soon after being turned off, the safety valve cannot be opened. When the thermocouple cools, at which time the armature is released and the latching means relatches the lever means, the safety valve may then be opened.</p> |
