Abstract: Inaccurate readings of the air flow in an air flow system obtained by an air flow sensor because of an uneven air velocity distribution at the sensor are reduced in accordance with the present invention by providing an air redirecting means in the air flow closely adjacent and upstream from the air flow sensor. The air redirecting means is mounted for movement in response to impingement thereon of an air flow having an uneven velocity distribution so as to redirect the air flow and provide a more representative air velocity condition at the sensor.

Abstract: An apparatus for adjustably controlling the flow of air in an air conditioning system and comprising a regulator having flow control means movable in response to fluctuations in the pressure of the air supplied to the regulator for maintaining the flow of air passing through the regulator at a substantially constant rate and having flow adjustment means cooperating with the flow control means for permitting varying the flow rate maintained by the flow control means.

Abstract: A mixing valve for mixing airstreams of different characteristics in an air distributing system, and wherein the mixing valve is provided with first and second groups of louvers so arranged that one group of louvers is moved toward an open position as the other group of louvers is moved toward a closed position and vice versa, and means is responsive to movement of either group of louvers toward and into closed position for exerting an opposing force thereon for aiding in subsequently opening the same against the force of an airstream impinging thereon.

Abstract: A mixing valve for mixing airstreams in an air distributing system including a housing having first and second air inlet passages therein for receiving respective airstreams of different characteristics, valve means cooperating with the first and second inlet passages for adjustably selecting the proportion of air received through the respective passages so as to obtain a mixture of the two airstreams from the mixing valve, and an actuator cooperating with the valve means for effecting adjustment of the same to obtain a desired mixture of the different airstreams from the mixing valve. The actuator includes a thermal motor having an axially movable shaft extending therefrom, a heater cooperating with the thermal motor for applying heat thereto to effect movement of the motor shaft toward an extended axial position, and linkage operably interconnecting the thermal motor and the valve means and being movable in response to axial movement of the motor shaft for effecting adjustment of the valve means.

Abstract: An air volume regulator for use in an air distribution duct for maintaining a substantially constant volume flow of air therethrough and having a pair of spaced apart opposing airfoils positioned so as to define a passageway for the flow of air therebetween, with the airfoils being pivotally mounted adjacent their leading ends with trailing portions extending in the downstream direction. The flow of air between the opposing airfoils exerts a force over the surface of the airfoils to pivotally move the same relative to each other so that the size of the air passageway between the airfoils is varied in response to fluctuations in upstream pressure to thereby maintain the flow of air from the regulator substantially constant.

Abstract: An adjustable air volume regulator adapted for maintaining a constant volume flow of air therethrough regardless of variations in pressure of the air being supplied to the regulator and being adjustable for accurately maintaining a constant flow of air over a wide range of flow rates. The regulator includes a housing defining a passageway for the flow of air therethrough, valve means movable within the housing for adjustably restricting the flow of air therethrough, reciprocable linkage means cooperating with the valve means for controlling movement thereof, a spring mounted exteriorly of the housing and being connected to the linkage means for exerting an opening bias on the valve means in opposition to a closing bias imparted thereon by the pressure of the air in the housing, and means cooperating with the spring means for varying the biasing effect imparted thereby by varying the effective length of the spring for thereby adjusting the regulator to maintain a different substantially constant flow rate.

Abstract: An air volume regulator adapted for use in an air distribution system for maintaining a constant flow of air therethrough regardless of variations in pressure of the air being supplied to the regulator is provided with adjustment means to permit adjusting the regulator for maintaining constant flow at a variety of different flow rates. The regulator includes a housing defining a passageway for the flow of air therethrough, valve means movable within the housing for adjustably restricting the flow of air therethrough, and a coil compression spring cooperating with the valve means for exerting an opening bias thereon in opposition to a closing bias imparted on the valve means by the pressure of the air in the housing. Adjustment means is provided cooperating with the coil spring for immobilizing a selected number of the turns of the coil spring so as to vary the biasing characteristics of the spring and thereby adjust the regulator for maintaining a different flow rate.