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Dual seal fitting for enabling quick measurement of brake cylinder pressure

  • US 5,869,765 A
  • Filed: 07/28/1997
  • Issued: 02/09/1999
  • Est. Priority Date: 07/28/1997
  • Status: Expired due to Term
First Claim
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1. A dual seal coupling fitting for enabling quick measurement of brake cylinder pressure through a housing of a load sensor valve, such housing defining a chamber in communication with a brake cylinder of a railcar and a threaded bore in communication with such chamber, said dual seal coupling fitting comprising:

  • (a) a valve body having a protruding end shaped as a male portion of a quick connect coupling and a threaded end for screwing into such threaded bore, said valve body defining a passage therethrough with a first cylindrical section of said passage communicating with a second cylindrical section of said passage;

    (b) a valve stem having at a head end thereof a poppet valve moveable within said first cylindrical section for seating against an outer valve seat formed in said protruding end;

    (c) a spring stop secured approximately between said first and said second cylindrical sections;

    (d) a first spring disposed concentrically about said valve stem between said spring stop and said head end of said valve stem so that said poppet valve is compressed against said outer valve seat to provide a primary seal that prevents leakage of such pressure;

    (e) a cylindrical seat piece at one end formed as an inner valve seat and at an opposite end situated adjacent to said spring stop, said seat piece defining (i) an inner bore therethrough for receiving a terminal end of said valve stem and (ii) an annular groove circumferentially around said seat piece for retaining an o-ring to seal said cylindrical seat piece within said second cylindrical section adjacent to said spring stop;

    (f) a check valve retainer having at one end thereof a stem post within said inner bore approximate to said terminal end of said valve stem and defining an annular recess about a base of said stem post for retaining an annular check valve; and

    (g) a second spring having one end secured to an opposite end of said check valve retainer such that when said threaded end of said fitting is screwed into such threaded bore of such housing said second spring compresses said annular check valve against said inner valve seat to provide a secondary seal that also prevents leakage of such pressure such that mating a female portion of a quick connect coupling to said male portion causes said poppet valve to move away from said outer valve seat and said check valve to move away from said inner valve seat thereby allowing flow through said passage and enabling quick measurement of such pressure within such housing via a pressure measuring device attached to an opposing end of such female portion.

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