Abstract: A controller is disclosed for use in controlling environmental conditioning apparatus such as heating and air conditioning equipment in a building or the like. The controller is flexible in that it can control most types of such control devices and apparatus and it eliminates the necessity of a conventional local controller while permitting the use of a centrally controlled automated system if such is desired. The controller is self-contained in that it preferably has a display and keyboard for establishing and changing the operational limits of the apparatus that is to be controlled. Only one sensing device is needed for each apparatus that is controlled, since the signals that are generated by the sensing devices are compatible with the controller as well as with a central automated system if such is used. The controller eliminates the need for a conventional local controller for each apparatus and permits one controller to be used in conjunction with a plurality or a group of control devices.

Abstract: A valve for mixing liquids having different properties, maintains a selected flow ratio of the liquids despite pressure changes in the inlet lines, allows discharge through either of two outlets and permits regulation of the flow rate through either of the outlets. The valve includes a balancing poppet which senses pressure changes in inlet lines and adjusts flow rate to compensate therefor, means for regulating the ratio of two liquids entering the valve and a diverter for selecting the one of the two outlets and for regulating the flow rate through either of the outlets.

Abstract: A system for use in supervising and controlling temperature and other environmental conditioning equipment of a building or the like is disclosed. The system monitors and controls various types of sensors and control equipment located at remote field points. The system includes a control console and a number of field located multiplexing modules which are connected to various remote field points. Each of the multiplexing modules is connected to associated field points that are connected to each other and to the multiplexing module in a single leg circuit. The multiplexing modules and control console are also connected together. The multiplexing modules simultaneously and independently poll their associated field points and only communicate with the control console for an alarm special or changed condition. The field points include common field point modules which interface with any of various field point units which comprise sensors or control field point apparatus.

Abstract: A pneumatic transport system capable of transporting a delivery container around a sharp bend or corner without the need for conduit disposed on a large radius of curvature. A first conduit and a second conduit communicating with the first conduit are provided along with a blower system for creating a pressure differential in the conduits. The first conduit is designed to receive a delivery container, which is transported to a pneumatically movable capsule, disposed within the second conduit. A first port is provided in the capsule for causing the pressure differential to act on the capsule when the delivery container is placed therein to transport the capsule to a receiving station, and for causing the pressure differential to act on the delivery container at the receiving station for discharging the container from the capsule. A second port is provided for causing downstream pressure to pass to the atmosphere when the delivery container is not disposed within the capsule.

Abstract: Apparatus to override the primary pneumatic circuitry of an air distribution system during warm up cycles. Means are provided for nullifying the pressure signal, indicative of ambient temperature, to which the flow controller responds. In the preferred embodiment, the override means comprises a bimetallic helical element which operates to bleed the pneumatic thermostat's air supply, thereby reducing the temperature indicative signal to zero.

Abstract: An improved pneumatic thermostat is provided which is capable of generating from a variable pressure air supply a pressurized air signal indicative of ambient temperature. The thermostat is used in conjunction with an air flow regulator in an air distribution system and utilizes as an air supply a portion of the air flow being distributed. The thermostat utilizes a pressure reducing valve which is referenced to pressure downstream from the air flow regulator, a flapper and nozzle pneumatic mechanism activated by a bi-metallic lever, and a self-aspirating arrangement which insures the bi-metallic lever is continuously sensing the true ambient temperature.

Abstract: A fluid flow regulating device for use in fluid handling systems which is capable of maintaining substantially constant flow rates over a wide range of variations in system pressure. The device includes a housing having disposed therein a conduit whose lateral wall includes one or more apertures of a predetermined configuration. A piston is disposed within the conduit and is axially displaceable, in response to pressure differentials, throughout the portion of the conduit wherein the apertures are located. A spring mechanism having a specified non-linear coefficient of stiffness is employed to yieldably resist downstream displacement of the piston. The piston and aperture together form a variable area flow passageway through which substantially all the fluid must pass. A pneumatic, thermometric mechanism may also be employed to displace the piston within the conduit in response to changes in temperature and independent of pressure variations.