US PATENT SUBCLASS 431 / 77
.~.~ Of shutdown by response to sensed combustion failure or overheat

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.~.~ Of shutdown by response to sensed combustion failure or overheat {4}
78  DF  .~.~.~> By electrical control circuit {2}
81  DF  .~.~.~> Manual setting means for biased valve released upon sensed combustion
82  DF  .~.~.~> With fuel feed means downstream of shutdown valve
83  DF  .~.~.~> Sensor movement losses means holding shutdown valve open against bias {1}

DEFINITION

Classification: 431/77

(under subclass 75) Apparatus in which the sensor responds to combustion failure or overheat to actuate a means terminating combustion and so disabling the burner that external intervention is necessary for restart.

SEE OR SEARCH THIS CLASS, SUBCLASS:

15, for means indicating shutdown or aborted start attempt.

51+, for a system in which a sensor of a first burner cuts off itself and a second burner upon sensed failure of combustion of the first burner.

69+, for shutdown requiring reset by sensed absence of flame in a proving period.

SEE OR SEARCH CLASS 137, Fluid Handling,

65+, for a fluid handling system that may be a part of a burner organization, having a flow control device in a feed line to a burner where a burner controlled by the device is not included and which device is automatically actuated to discontinue feed responsive to a temperature drop; and subclass 457 for a line condition change responsive safety cutoff valve of general utility that requires reset.