Device according to claim 1, wherein said safety thermostat comprises an element filled with wax, wherein said wax changes to the liquid phase when exceeding a temperature above the control range.Ħ. Device according to claim 3, wherein said supporting means comprises a supporting tube in a metallic bellows of said control thermostat.ĥ. Device according to claim 2, wherein said supporting means is arranged in said control thermostat in order to define the length of said control thermostat at failure.Ĥ. The invention of claim 1, wherein said control thermostat means comprises an expandable means filled with a temperature responsive expandable medium to increase in length as its temperature changes, and supporting means to limit its length reduction upon failure of said expandable medium.ģ. Means connecting said safety thermostat means to said lower end of said immersion shell to override the effect of said control thermostat means by pushing upward to raise said lower end when an excessive high temperature exists in the boiler.Ģ. Safety thermostat means having a sensitive range outside of the control range of said control thermostat means, and Means connecting said immersion shell to said housing,Ĭontrol thermostat means having a control range and contained inside said shell between said push rod and a lower end of said immersion shell wherein said control thermostat means comprises means for increasing in length upon a change in temperature causing said push rod to move upward to operate said lever means, Lever means pivotally supported on said housing, said lever means having an output arm adapted to be connected to a boiler draft apparatus and a second arm abutting against a face of said push rod,Īn immersion shell adapted to be inserted into the boiler to be in contact with the boiler water, A boiler draft control device comprising:Ī housing containing a push rod, spring biased downward away from a temperature setting knob,
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