AUTOMATIC GAS SHUT-OFF UNIT EQUIPPED WITH RETURN SAFETY MECHANISM

摘要

PURPOSE:To save electric power in an automatic gas shut-off unt by connecting organically a lock type electromagnetic valve, an ordinary electromagnetic valve, and a regulator in such a way that no electric power is consumed in a normal case. CONSTITUTION:Actuation of a vibration-sensing sensor connected to an option terminal 8 excites a lock releasing coil 9 for a lock type electromagnetic valve A in order to close said valve instantaneously, shutting off a gas passage. At this time a switch 5 makes its contact ''close ''. As the result, the pressure in a diaphragm chamber of a regulator C drops, shifting all contacts of regulator switches to the cross side in a normal case. Thus a circuit of a regulator switch 10 is connected to that of a regulator switch 5, and a flasher F becomes ''ON'', while a display lamp starts flashing. Even if a starting swtich 2 is pressed under this condition, the lock-type electromagnetic valve A does not open. If a return switch 11 is pressed, a timer E starts its function impressing and exciting a coil 13 of an ordinary electromagetic valve B, which opens said valve B.