Title: Motor control apparatus for three position valve

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Abstract: A motor control apparatus having an electric motor which is driven in one direction by an alternating current power source and in a return direction by a spring return wherein a holding or braking of the motor is accomplished by the application of a source of direct current power to magnetize the motor and hold it in a predetermined intermediate position after the removal of the alternating current power source. The braking or holding action is removed by taking away the direct current power source and momentarily applying an alternating current power source to the motor to de-magnetize or degauss the motor so it is free to return to its initial condition under the power of the spring return. The motor control apparatus is particularly adapted for use to control a three position water valve supplying water to two different areas or zones as required by zone thermostats to have water supplied to one or the other of the zones or both of the zones depending upon the demand by the thermostats and the position of the motorized valve.


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