Fluid handling – Combustion failure responsive fuel safety cut-off for burners – Thermo-electric
Patent
1998-06-29
2000-05-23
Huson, Gregory L.
Fluid handling
Combustion failure responsive fuel safety cut-off for burners
Thermo-electric
431 54, F23D 516
Patent
active
060654848
ABSTRACT:
The invention is an improved pilot valve for controlling the flow of gaseous fuel to both a pilot burner and a main burner, the pilot valve comprising a housing having an inlet part, a pilot port and a main burner port; a bore extending through the housing between the pilot port and main burner port; a stop shuttle normally biased to a seated position in which it blocks communication between the inlet port and the bore; a reset shuttle positioned in the bore for lifting the stop shuttle from its seated position, the reset shuttle supporting a sealing member for sealing the inlet port from the main burner port but permitting communication between the inlet port and the pilot port when the reset shuttle lifts the stop shuttle from its seated position; a thermocouple capable of generating a voltage from the heat of the pilot burner; and an electromagnet connected to the thermocouple and capable, when fully energized, of holding the stop shuttle from moving to its seated position; wherein the reset shuttle is movable by the force of gas pressure from the inlet port to a position in which the sealing member permits both the main burner port and the pilot port to communicate with the inlet port.
REFERENCES:
patent: 2988098 (1961-06-01), Thomas
patent: 3451407 (1969-06-01), Fairley et al.
patent: 3574308 (1971-04-01), Battersby
patent: 4437830 (1984-03-01), Harris et al.
patent: 5718256 (1998-02-01), Buezis et al.
patent: 5785511 (1998-07-01), Shah
patent: 5890037 (1999-03-01), Kukimoto et al.
Bartel Nathan G.
Batt Randall G.
FMC Corporation
Huson Gregory L.
Kim Joanne Y.
Query, Jr. Henry C.
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