| 摘要 |
PURPOSE:To certainly obtain a return signal by providing a return detecting circuit of a gas emergency trip valve having a differential-formed counter electromotive voltage detecting section for detecting counter electromotive voltage of the gas emergency trip valve. CONSTITUTION:The counter electromotive voltage detecting section of a gas emergency trip valve 3 is made to be in differential motion by coupling the gas emergency trip valve with a comparing section 12 by means of a condenser 7. Reference voltage for accepting return of gas emergency trip valve consists of a group of resistances 8-11, and a return signal is generated by mutual comparison of differential signals. By the above mechanism, even small counter electromotive voltage can be responded to, free design is enabled by counter electromotive voltage, also no influence of temperature is caused, and dispersion among respective return voltages is diminished.
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