Abstract: In variable air volume systems of buildings, a vortex valve is used for varying the volume of the air moving through the system.

Abstract: The present invention is one that uses the novel feature of fluidics to control the flow of conditioned air in an air-conditioning system. More specifically, in one species of the invention, fluidic amplifier apparatus controls the flow of hot water into the coils and, therefore, controls the changeover from cool to warm air in the main duct, and in a second species it not only controls the mentioned changeover but also the volume of the conditioned air flowing in the duct.

Abstract: In a system to control a condition of air in a duct, there is disclosed a first nozzle for issuing a jet of fluid, a second nozzle for receiving a portion of said fluid depending upon the condition of the air in the duct, and a circuit arrangement for controlling a damper in the duct dependent upon the amount of fluid received by the second nozzle.

Abstract: A double induction mixing box is provided with damperless openings to each of two opposite side passages in the box and fluidic diverter means between a primary air supply to the box and the opposite side passages is used for controlling the diversion of primary air between the opposite side passages to correspondingly control the proportioning of the induction of air into the two damperless openings from a room air source and from a ceiling plenum air source.

Abstract: The present invention relates to an air-conditioning system that employs fluidic principles to provide temperature control. A fluidic oscillator is utilized to control the conditioning process in which the imput of primary and secondary air to the system is controlled in a push-pull manner so that the supply of primary air increases to the extent the supply of secondary air decreases, and vice versa. Accordingly, the fluidic apparatus regulates the ratio of primary to secondary air directed into the room to be conditioned.

Abstract: An air distribution system supplies conditioned air to at least one zone to be conditioned and comprises a supply duct connected with a diffuser discharging into the conditioned zone. A modulating valve in the supply duct is provided with a bellows actuator for regulating the flow of air into the zone and a secondary conditioning apparatus such as a heater is provided in the supply duct for warming the air before introduction into the zone. The control system for the bellows actuator and for the secondary conditioning apparatus is of the fluidic type with power for the actuator and control system supplied from a total pressure pick-up in the duct. A thermostat for supplying temperature responsive fluidic signals to the bellows and control system is provided with manual adjustments for setting the minimum and maximum flow rates of conditioned air into the zone.

Abstract: In a system to control a condition of air in a duct, there is disclosed a first nozzle for issuing a jet fluid, a second nozzle for receiving a portion of said fluid depending upon the condition of the air in the duct, and a circuit arrangement for controlling a damper in the duct dependent upon the amount of fluid received by the second nozzle.