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Pressure-reduction device for pressurized coupling members

  • US 4,564,042 A
  • Filed: 09/13/1984
  • Issued: 01/14/1986
  • Est. Priority Date: 09/22/1983
  • Status: Expired due to Term
First Claim
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1. A pressure-reduction device for a quick coupling having first and second parts, at least said first part being provided with said device and including a first valve member having a valve body by means of which a first passageway for a fluid is able to be opened and closed, said device comprising a spherical member arranged in said valve body so as to be capable of bearing against a seat in a closed position in response to a biasing effect of a spring member positioned in a first recess defined by a wall of said valve body, and a pressure pin held in a second recess in said valve body by means of a bushing capable of interacting with a flange on an intermediate portion of said pressure pin, one end of said pressure pin being capable of interacting with said spherical member and another end of said pressure pin being capable of interacting with said second part of the coupling;

  • said spring member biasing said spherical member against said seat via a power transmission member which is guided by the wall of said first recess;

    said spherical member being arranged to be moved to an open position against the biasing effect of said spring member by said pressure pin as the first part of the coupling is connected to the second part of the coupling so as to open a second passageway for said fluid before said first passageway is opened by the valve body of said first valve member; and

    said opening of said second passageway causing a pressure-reduction effect in the first part of the coupling by diverting a small quantity of said fluid from the inside to the outside of the first part of the coupling via said second passageway.

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