(under the class definition) Subject matter comprising a flow control device or safety valve in the fuel supply to a burner which is automatically actuated to discontinue the fuel flow in response to the extinguishment of the main or pilot burner.
(1) Note. These devices are not self-opening, but must be manually reset, usually requiring that the pilot burner be lighted first.
SEE OR SEARCH THIS CLASS, SUBCLASS:
405, for cut-offs responsive to an accumulation of unburned fuel oil delivered to a burner.
456+, for safety cut-offs responsive to a change in line condition, which also require resetting.
SEE OR SEARCH CLASS
431, Combustion, 42+, for a burner system in which the sensor of a first burner controls a second burner and subclasses 77+ for a burner shutdown by a means sensing a failure of the burner flame.
