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Fluid flow control regulator

  • US 4,922,956 A
  • Filed: 06/30/1988
  • Issued: 05/08/1990
  • Est. Priority Date: 06/30/1988
  • Status: Expired due to Fees
First Claim
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1. An improved constant flow control valve comprising:

  • a housing including means defining an inlet port and an outlet port;

    a piston movably disposed with said housing between said inlet and outlet ports, said piston being operative to vary the effective open area of said outlet port in response to forces acting on opposite sides thereof to thereby define a variable orifice, said variable orifice having a shape such that the open area thereof varies linearly with respect to movement of said piston over the entire range of said variable orifice; and

    means defining an adjustable orifice in said piston, said adjustable orifice defining a flowpath for placing said inlet and outlet in fluid communication, said adjustable orifice having a shape such that the open area thereof varies linearly over the entire range of adjustment thereof,said adjustable orifice and said variable orifice cooperating to provide a predetermined substantially constant flow rate over a substantial range of inlet and outlet fluid pressures.

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