Universal Pneumatic Controls, Inc.

Le Roy Ginn

Dalny Travaglio

Le Royce Ginn

John C Morris

A variable air flow volume conditioned air distribution system of the kind having an air flow duct for supplying conditioned air to a room and a valve in the duct for regulating the volume of air flowing through the duct has a controller which senses the flow velocity in the duct and the room temperature in the room. The controller combines a temperature signal with a flow velocity signal through a velocity spring. A temperature change resets the flow velocity set point and produces a corresponding change in the volume flow through the duct. The controller includes an adjustable bias for the velocity spring for varying the rate of the velocity spring from a low spring rate for control at a low maximum permitted flow velocity in the duct to a higher spring rate for control at a higher permitted maximum flow velocity flow in the duct and vice versa.

System powered reset velocity controller

A dual duct variable volume air conditioning system has a first, cold duct for supplying cold air and a second, reset duct for supplying either hot air in a first mode of operation or cold air in a second mode of operation. A self-contained system regulator positions first and second valves in the first and second ducts in response to changes in room temperature. The regulator is effective to reverse the direction of response of the second valve to temperature in the second mode of operation from the direction of response of that valve to a similar temperature change in the first mode of operation so that the reset duct can be used as a hot duct with the system supplying warm or cold air on demand in the heating season (without mixing) and as a cold duct to double the cooling capacity of the system in the cooling season. The system includes an integrated sensor-actuator for each air flow duct having a diaphragm which both senses the flow velocity in the duct and positions the valve in the duct through a direct mechanical connection. The actuator moves the valve with changes in flow velocity using the pressures in the duct without a relay.

Growing community of inventors

San Leandro, CA, United States of America

Le Roy Ginn