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Compressed air control system

  • US 5,325,884 A
  • Filed: 07/10/1991
  • Issued: 07/05/1994
  • Est. Priority Date: 07/10/1991
  • Status: Expired due to Term
First Claim
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1. An air control system for a main conduit of a substantially continuous flow compressed air system in which air-weight flow throughout the air control system is controlled comprising compressed air supply means providing an air supply, air-operated equipment served by said compressed air supply means and providing an air demand and a main air supply conduit connected between said compressed air supply means and said air-operated equipment to channel said air supply to said air demand, said air supply being subject to fluctuation according to variations in said air supply means and in said air demand wherein said air control system comprises:

  • a) a continuously variable adjustable flow controller for controlling air flow through said main air supply conduit, said flow controller comprising a plurality of flow sub-controls in parallel configuration, each of said sub-controls having a low inertial, mechanical and fluid dynamic hysteresis;

    b) pressure monitoring means downstream of said flow controller and generating a pressure related demand signal, said demand signal fluctuating over time as a function of variations in said pressure;

    c) actuator means to operate said flow controller in response to said demand signal to stabilize downstream air pressure;

    thereby to adjust said flow controller to vary said air flow rate in said main air conduit according to downstream pressure variations; and

    d) a by-pass sub-control openable in response to a predetermined pressure difference across said control unit to provide a substantially free-flow by-pass airway.

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