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Controlled flow hydraulic system

  • US 4,625,513 A
  • Filed: 03/28/1983
  • Issued: 12/02/1986
  • Est. Priority Date: 03/28/1983
  • Status: Expired due to Term
First Claim
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1. A hydraulic system comprising:

  • a fluid reservoir;

    a bidirectional pump;

    a variable volume load having an inlet port, said load being moved in one direction by the introduction of fluid through said inlet port and being moved in the opposite direction by the withdrawal of fluid from said inlet port;

    a flow matching control valve having a source port, a load port and a drain port, said control valve being characterized in that a hydraulic flow into the source port produces a matching controlled flow into the load port, both flows exiting the control valve together through said drain port;

    means connecting said reservoir to both sides of said pump through respective check valves permitting flow from the reservoir toward the pump;

    means connecting one side of said pump to the source port of said control valve;

    means connecting the load port of said control valve to the inlet port of said load;

    means connecting the drain port of said control valve to said reservoir; and

    means connecting the other side of said pump to the inlet port of said load through a check valve permitting flow from said pump toward said load.

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