| 摘要 |
<p>A fail-safe circuit for gas valve, has at least one input (11) connected to a control device and at least one output (12,13) connected to a gas valve, in which the fail-safe circuit (10) prepares an output voltage at those outputs for opening a gas valve, when at the output (11) of the fail-safe circuit (10) an input is provided from the control device and has at least two different time-sequential frequency signals.</p> |
