Safe gas control valve for use with standing pilot
AssigneeHoneywell Inc.
InventorPaul Dietiker
Life of this patent
Estimating the term…
Abstract
A fuel gas control valve capable of internationally acceptable operation, including a main valve operable in an on-off mode by an electromagnetic actuator that receives a signal from a conventional electric thermostat. A pilot valve is initially operated by a manual control, and is retained in the operating position by a power unit responsive to sensed presence of a pilot flame. A latching mechanism associated with the manual control interrelates with the main valve and overrides operation of the electromagnetic actuator in the event the pilot flame is extinguished for any reason. The valve also includes a mechanism that retains the manual control in pilot position until the pilot flame is established.
Claims15
A gas valve for a gas burning appliance, comprising:
- housing means defining an inlet adapted for connection to a source of gas, a main outlet adapted for connection to a gas burning appliance and a pilot outlet adapted for connection to a pilot burner on the appliance;
- pilot valve means disposed between the inlet and pilot outlet for controlling the flow of gas therebetween;
- main valve means disposed between the inlet and main outlet for controlling the flow of gas therebetween;
- first control means for opening and closing the main valve means in response to a control signal;
- manually operated control means operatively connected to the pilot valve means and movable between a first position in which the pilot valve means is closed and a second position in which the pilot valve means is opened, said manually operated control means being biased to the first position;
- second control means operatively connected to the manually operated control means for retaining the manually operated control means in the second position when a pilot flame has been established at said pilot burner and for releasing said manually operated control means for return to the first position in the absence of a pilot flame;
- and
- overriding control means operatively connected to the second control means and said main valve means for closing the main valve means in overriding relation to the first control means when said pilot valve means is closed.
Dependencies are inferred from the claim text.