Emerson Electric Company

Michael C Santinanavat

John Francis Broker

William P Butler

Mark H Stark

Ryan Jensen

Jagdish C Atri

Shweta Annapurani Panimadai Ramaswany

Ryan D Jensen

A stepper-motor gas valve control is disclosed that includes a main diaphragm in a chamber that controllably displaces a valve relative to an opening in response to changes in pressure, to adjust fuel flow through the valve. A servo-regulator diaphragm is provided to regulate flow to the main diaphragm, to thereby control the rate of fuel flow. A stepper motor is configured to move in a stepwise manner to displace the servo-regulator diaphragm, to control fluid flow to the main diaphragm. A controller mounted on the stepper-motor regulated gas valve control receives and converts an input control signal from a heating system to a reference value between 0 and 5 volts, and selects a corresponding motor step value. The control responsively moves the stepper-motor in a step wise manner to displace the servo-regulator diaphragm and thereby regulates the rate of fuel flow through the valve.

Stepper motor valve and method of control

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St. Louis, MO, United States of America

Michael C Santinanavat