Combustion – Timer – programmer – retarder or condition responsive control – Shutdown by sensed absence of flame in proving period
Patent
1977-12-05
1980-06-10
Dority, Jr., Carroll B.
Combustion
Timer, programmer, retarder or condition responsive control
Shutdown by sensed absence of flame in proving period
431 78, 137 66, F23M 500, H01M 484
Patent
active
042070546
ABSTRACT:
A safety ignition valve for a pilotless burner comprises a valve body having an inlet for connection to a fuel supply, an outlet for connection to the burner and a valve seat between the inlet and outlet. A valve member is movable between a closed position in which it is seated on the valve seat and an open position in which it is spaced from the valve seat. A spring acting on the valve member biases it toward closed position. A first solenoid which is energized by current produced by a thermocouple heated by the burner acts on the valve member to hold it in open position against the bias of the spring. A second spring solenoid located in a control box fixed to the valve body actuates a plunger for moving the valve member to open position when the second solenoid is energized. Circuitry is provided for energizing an igniter associated with the burner and for energizing the second solenoid for a short period of time to move the valve member from closed to open position and to hold it in open position until the burner has been ignited and the thermocouple is heated by the burner to energize the first solenoid. Thereupon the first solenoid takes over and holds the valve member in open position. In one embodiment both solenoids are on the same side of the valve member and operate through the same plunger while in another embodiment the first solenoid is on one side of the valve member and operates on a valve stem while the other solenoid is on the opposite side of the valve member and actuates a plunger which acts on the valve member.
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Adams Bruce L.
Burns Robert E.
Dority Jr. Carroll B.
Green Randall L.
Lobato Emmanuel J.
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