US PATENT SUBCLASS 431 / 81
.~.~.~ Manual setting means for biased valve released upon sensed combustion

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}
81.~.~.~ Manual setting means for biased valve released upon sensed combustion

DEFINITION

Classification: 431/81

(under subclass 77) Apparatus including a burner feed line with a valve biased toward closed position which, when manually opened, is held in the open position by a holding means which is released by a means sensing establishment of combustion at the burner; the valve thereafter being under the control of a means sensing overheat or failure of combustion at the burner.