US PATENT SUBCLASS 431 / 83
.~.~.~ Sensor movement losses means holding shutdown valve open against bias

Current as of: June, 1999
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431 /   HD   COMBUSTION

18  DF  TIMER, PROGRAMMER, RETARDER OR CONDITION RESPONSIVE CONTROL {26}
75  DF  .~ By combustion or combustion zone sensor {2}
77  DF  .~.~ Of shutdown by response to sensed combustion failure or overheat {4}
83.~.~.~ Sensor movement losses means holding shutdown valve open against bias {1}
84  DF  .~.~.~.~> Held by latch, latch released by sensor {1}

DEFINITION

Classification: 431/83

(under subclass 77) Apparatus including a shutdown valve acted upon by a continuously applied force tending to move it toward closed position, the valve being held open against the force, by a restraining means (e.g., catch, brake, etc.), and the restraining being released by the sensor to free the valve for movement by the biasing force.

SEE OR SEARCH THIS CLASS, SUBCLASS:

52+, for a manually reset cut-off valve that cuts off two burners simultaneously.