Fluid actuated damper control apparatus
OwnerPaul F. Swensoninventor
Life of this patent
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Abstract
An apparatus for opening and closing the draft hood discharge opening and vent and fuel line of a fluid fuel-fired heating device such as a domestic water heater. The disclosed apparatus includes a diaphragm-type expansible chamber fluid motor assembly mechanically linked to a damper assembly such that when the heating devices call for heating, the supply of pressurized fuel acts to actuate the motor for opening the damper assembly. The motor assembly also has a pressure output line which operates a fail-safe type of diaphragm valve for controlling flow. This prevents burner operation until after the dampers are open. Additionally, when the supply of fuel is terminated, the motor assembly does not close the damper assembly until after the diaphragm valve stops fuel to the burner.
Claims6
In a heating apparatus of the type including a fluid fuel burner, a vent for discharging the products of combustion produced by said burner, a supply line for supplying fluid fuel to said burner and a main valve means operable between open and closed positions for controlling the flow of fuel through said supply line to said burner, the improvement comprising:
- at least one damper means movable between open and closed positions for controlling flow through said vent;
- expansible chamber fluid motor means connected to said flow control damper means for moving said damper means to an open position when pressurizied and to a closed position when unpressurized;
- connection means for pressurizing said expansible chamber motor means whenever said main valve means is in an open position;
- a pressure-operated control valve in said supply line between said main control valve and said burner for preventing flow of fuel to said burner until pressurized;
- and,
- means for pressurizing said pressure-operated control valve only when said motor means operates to open said damper means.
Dependencies are inferred from the claim text.