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Method and apparatus for enhancing stability in hydraulic flow control

  • US 5,775,361 A
  • Filed: 12/28/1994
  • Issued: 07/07/1998
  • Est. Priority Date: 02/16/1993
  • Status: Expired due to Fees
First Claim
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1. A flow control device for use in a hydraulic system, said device comprising:

  • a housing having a cylinder and a bypass hole communicating with said cylinder, means for delivering pressurized fluid into said cylinder;

    an output fitting mounted at one end of said cylinder, said output fitting having a first passageway for delivering pressurized fluid to a venturi;

    a piston reciprocally mounted in said cylinder, said piston being movable within said cylinder to open and close said bypass hole;

    means for biasing said piston towards said output fitting;

    means for sensing pressure in said venturi, said means for sensing extending between said venturi and a second passageway formed in said housing; and

    a metering passage communicating between said first passageway of said output fitting and said second passageway in said housing for producing a flow through said means for sensing to generate hydraulic resistance in said flow control device.

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