Patent attributes
A temperature control system for a gas appliance utilizes an improved variable orifice gas flow modulating valve capable of direct modulation of gas flow through an orifice directly into a gas burner to provide a constantly maintained temperature in an appliance working compartment, as selected by human interface via a temperature selector. An actuator attached to a gas fitting body of the valve provides for linear movement of a metering pin into the taper inside the orifice, accomplishing the variable controlled modulated flow of gas directly into the burner. The actuator is controlled by an input signal from a programmable controller whose output is determined by calculations based on inputs from a temperature selector and a temperature sensor located in the gas appliance working compartment.
