AUTOMATIC BOILER SAFETY VALVE CONTROL DEVICE Russian patent published in 2012 - IPC F22B37/44 

FIELD: machine building.

SUBSTANCE: automatic boiler safety valve control device containing the grid actuation contacts, magnetic conductor with coil, armature and stock, valve body with inlet and outlet connection pipes. Three time relays are parallel connected to the power supply and to each other through the switch and have various time set points, coil of electromagnet; at that, normally closed contact of the second (electromagnetic) relay is in series connected with the first relay, and parallel to the first relay there connected is indicating light, the third (electromagnetic) relay and the second (electromagnetic) relay through normally open contact of the third (electromagnetic) relay and normally closed contact of the first relay, which are in series connected to each other and to the power supply; at that, parallel to the second (electromagnetic) relay there connected is indicating light and through limit switch, the microswitch of which is rigidly connected to the valve cover plate, there connected is contactor switch, and parallel to the third (electromagnetic) relay there electrically connected through the contactor switch contact is audio warning device and indicating light.

EFFECT: device allows improving the reliability of actuation and simplifying the design.

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