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Bidirectional flow control device

  • US 5,813,244 A
  • Filed: 08/18/1997
  • Issued: 09/29/1998
  • Est. Priority Date: 11/25/1996
  • Status: Expired due to Fees
First Claim
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1. A device for controlling the flow of a fluid in a conduit both a first and second direction comprising:

  • an elongated body having a first end wall and a second end wall defining an internal chamber therebetween;

    the first end wall having at least one bypass opening axially extending therethrough and in communication with the internal chamber;

    the second end wall having a first metering orifice axially extending therethrough;

    a foreshortened piston disposed in the internal chamber and being slidably movable axially in response to fluid flow, the piston having a first end face parallel to the first end wall and a second end face parallel to the second end wall;

    a rod portion extending from the second end face slidably disposed within the first metering orifice;

    the piston and rod portion further having a second metering orifice extending therethrough and in axial alignment with the first metering orifice;

    whereby the piston meters flow-through the second metering orifice in a first fluid flow direction and meters flow serially through the first orifice and thence the second orifice in a second fluid flow direction and permits the fluid to flow into the conduit.

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