Abstract: Apparatus for controlling the delivery of air in a forced air distribution system having a source of air under pressure (4), a duct system to deliver the air, and a plurality of ports (8) in the duct system with each port defining an air delivery zone (16). The apparatus includes a vent member (20) associated with each of the ports which is movable between an open position to admit air to the zone and a closed position to block air from the zone. Independent actuator units (50) are provided to move the vent member between the open and closed positions controlled by a central control system. Thermostats in each air delivery zone communicate with the central control system (80) to control operation of the actuators units and the source of air under pressure which generally comprises heating or cooling equipment such as a furnace or air conditioning unit.

Abstract: Apparatus for controlling the delivery of air in a forced air distribution system having a source of air under pressure (4), a duct system to deliver the air, and a plurality of ports (8) in the duct system with each port defining an air delivery zone (16). The apparatus includes a vent member (20) associated with each of the ports which is movable between an open position to admit air to the zone and a closed position to block air from the zone. Independent actuator units (50) are provided to move the vent member between the open and closed positions controlled by a central control system. Thermostats in each air delivery zone communicate with the central control system (80) to control operation of the actuators units and the source of air under pressure which generally comprises heating or cooling equipment such as a furnace or air conditioning unit.

Abstract: A body having a channel therein in which a flow valve is movably mounted. An inlet communicating with the channel near one end thereof, and an outlet communicating with the channel spaced from said inlet. The flow valve has a head near the end of the channel in communication with the inlet and adapted normally to engage a seat in the channel to close the latter, a stem of smaller cross section that the head, and a guide portion remote from the head and slidably fitting in the channel. Means for moving the valve to move the head thereof off the seat to permit water to flow from the inlet past the head to the outlet, said water gradually moving the head back on the seat.