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Low spill quick disconnect coupling

  • US 6,237,631 B1
  • Filed: 08/03/2000
  • Issued: 05/29/2001
  • Est. Priority Date: 08/19/1999
  • Status: Expired due to Term
First Claim
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1. A low-spill, quick disconnect female coupling member connectable to a male coupling member having a valve with a conical valve head projecting forwardly from a forward end of a body, the female coupling member comprising:

  • a body having an axially-extending internal cavity and a forward end dimensioned to receive the body of the male coupling member in a forward cavity portion of the internal cavity;

    a cylindrical piston sleeve slideably received within the forward cavity portion of the female body, the piston sleeve having an annular surface facing the forward end of the female body;

    a spring urging the sleeve toward the forward end of the female body;

    a radially-inward projecting annular valve seat of the female body separating a rear cavity portion of the internal cavity from the forward cavity portion;

    a valve stem assembly slideably received within the internal cavity, the valve stem assembly including i) a poppet valve disposed within the rear cavity portion of the internal cavity and dimensioned to be sealingly seated forwardly against the valve seat when the female coupling member is in an uncoupled condition to prevent fluid flow forwardly through the female coupling member; and

    ii) a valve stem portion connected to the poppet valve and extending forwardly from the poppet valve toward the forward end of the female body, the valve stem portion including a valve head sealingly mating with the piston sleeve when the female coupling member is in the uncoupled condition, the poppet valve urged forwardly by the spring operating through the engagement of the valve head and the piston sleeve into sealing relation with the valve seat when the female coupling member is in the uncoupled condition, the valve head including a forwardly-opening conical cavity dimensioned to closely receive the conical valve head of the male coupling member, and the annular surface of the sleeve of the female coupling member matable flush against the forward end of the body of the male coupling member when the male coupling member and female coupling member are connected together, the sleeve and the valve stem assembly being axially displaced rearward in the female body when the male coupling member is inserted into the female coupling member such that the poppet valve moves rearwardly away from the valve seat and the piston sleeve moves away from the valve head of the valve stem portion to allow fluid to flow through the female coupling member.

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