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Pneumatic control circuit for air distribution systems

  • US 4,331,291 A
  • Filed: 10/14/1980
  • Issued: 05/25/1982
  • Est. Priority Date: 10/14/1980
  • Status: Expired due to Term
First Claim
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1. In an air distribution system for applying conditioned air to an area, the combination of:

  • a duct adapted to receive conditioned air at a relatively high supply pressure, said duct having an outlet for discharging conditioned air at a relatively low pressure to said area;

    pressure responsive actuator means for controlling the flow of conditioned air through said outlet, said actuator means being in communication with a pressure source and acting in response to the pressure therefrom in a manner to reduce the flow through said outlet;

    an exhaust line communicating with said actuator means for bleeding pressure therefrom to increase the flow through said outlet, said exhaust line having a control orifice therein;

    a diaphragm for opening and closing said control orifice to control the condition of said actuator means, said diaphragm having one side adjacent said control orifice and an opposite side communicating with said supply pressure;

    a velocity sensor for sensing the flow through said outlet, said sensor communicating with said opposite side of the diaphragm to urge same toward the control orifice in cooperation with the supply pressure; and

    temperature responsive thermostat means for bleeding pressure from said opposite side of the diaphragm at a preselected temperature in said area, thereby opening said control orifice to bleed pressure from said actuator means for increased flow of conditioned air through said outlet.

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