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Pressure compensator flow control

  • US 6,314,980 B1
  • Filed: 09/20/2000
  • Issued: 11/13/2001
  • Est. Priority Date: 09/21/1999
  • Status: Expired due to Fees
First Claim
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1. A pressure compensating flow control device comprising:

  • a housing having a upper body and a lower body wherein the upper body is sized to matingly engage the lower body;

    a piston chamber formed in the housing for receiving a piston in sliding engagement, the piston chamber has a top surface, a bottom surface and at least one side wall;

    a fluid inlet defined by portions of the lower body;

    a fluid outlet defined by portions of the upper body;

    a reducing valve situated inside the lower body wherein the reducing valve has portions defining a valve seat formed on a bottom surface of the reducing valve;

    a valve stem situated in the reducing valve that modulates relative to fluid pressure whereby the reducing valve prevents fluid communication between the fluid inlet and the fluid outlet when in a closed position and allows fluid communication between the fluid inlet and the fluid outlet when in an open position;

    a piston situated in the piston chamber wherein the piston slides within the housing and contacts the reducing valve and causes modulation of the reducing valve;

    a piston rod aperture formed in the piston for receiving a piston rod in sliding engagement;

    a piston rod situated in the piston chamber which has a channel provided therein to provide fluid communication between the inlet and the outlet;

    a reference spring which registers on the top surface of the piston chamber and a top surface of the piston wherein the reference spring has an axial load compression that creates a pressure differential; and

    , a needle valve for controlling fluid-flow rate and providing a set pressure differential.

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