Valve for furnace stack pipe
OwnerJohn H. Newellinventor
Life of this patent
Estimating the term…
Abstract
A valve is provided for installation in the auxillary duct of a furnace stack pipe. The valve prevents flow of air through the damper plate in the auxillary duct when the furnace is switched off. The valve is controlled by a temperature responsive bimetallic strip which is impinged upon by flue gases to move the valve to an open position upon the furnace being ignited and producing combustion gases.
Claims15
A valve for installation in an auxillary air duct of a furnace stack for controlling flow of air into the interior of said stack, said valve comprising a support member to engage sealingly the interior wall of said auxillary duct, a valve member movably mounted on said support member for movement from an open position in which flow is permitted to a closed position in which flow is inhibited, motor means operable upon said valve member to hold said valve member in said closed postion and control means responsive to operation of the furnace to which said stack is connected to cause said motor means to move said valve member to said open position, a lost motion device operably connected to said motor, said lost motion device including clutch means which operably connect said motor means and valve member for conjoint movement, and stop means to limit movement of said valve member at said open and closed positions, said clutch means thereby permitting continued movement of said motor upon engagement of said valve member with said stop means.
A valve for installation in an auxillary air duct of a furnace stack for controlling flow of air through said duct into said stack, said valve comprising a support member having a disc with a plurality of apertures therein to permit flow of air across said disc and an annular ring formed around the periphery of said disc to extend in sealing engagement with said duct, a valve member slidably mounted on a said disc and having at least one aperture therein, said valve member being movable from a closed position in which apertures in said disc and said valve member are not aligned and flow of air across said valve is inhibited to an open position in which apertures are aligned to permit overflow across said valve, motor means operable between said valve member and said disc to move said valve member between open and closed positions, control means responsive to temperature variations to operate said motor means to move said valve member toward said open position upon an increase in temperature and toward a closed position upon a decrease in temperature, stop means to limit movement between said valve member and said disc and lost motion means operably connected to said motor to permit continued movement thereof upon engagement of said valve member with said stop means, said lost motion means comprising clutch means which operably connect said motor means and valve member for conjoint movement between said stop means.
Dependencies are inferred from the claim text.