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Coupling member for pipe coupling

  • US 8,196,606 B2
  • Filed: 11/13/2007
  • Issued: 06/12/2012
  • Est. Priority Date: 11/17/2006
  • Status: Active Grant
First Claim
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1. A female coupling member comprising:

  • a cylindrical coupling body having a male member receiving portion and a fluid passage portion in communication with a fluid passage of a male coupling member when received into the male member receiving portion; and

    a valve device configured to open and close said fluid passage portion, said valve device being disposed in said coupling body, said valve device comprising;

    an outer valve seat portion projectingly formed on an inner peripheral surface of said coupling body so as to surround the male member receiving portion;

    an inner valve seat portion forming an annular valve opening between said outer valve seat portion and said inner valve seat portion in said coupling body;

    an annular valve member disposed in said coupling body so as to be displaceable in an axial direction thereof between a closed position where said valve member engages with said outer and inner valve seat portions to close the valve opening and an open position where said valve member is displaced in the axial direction away from said male member receiving portion toward said fluid passage portion to be apart from said outer and inner valve seat portions to open said valve opening;

    a spring configured to bias said valve member in the axial direction toward the closed position;

    an outer annular sealing member mounted on and around said valve member, said outer annular sealing member being configured to be moved without contact with said coupling body when said valve member is moved between the closed position and the open position and to be forced against said outer valve seat portion in the axial direction by said spring to seal between an outer peripheral surface of said valve member and said outer valve seat portion when said valve member is at the closed position; and

    an inner annular sealing member having a fixed portion fixedly attached to said valve member on a radially outer side with respect to said inner valve seat portion and an annular extending portion extending radially inward beyond an annular surface, which defines said valve opening of said inner valve seat portion, wherein, when said valve member is moved from the open position toward the closed position and approaches the closed position such that said valve member advances into said annular valve opening, said annular extending portion of said inner annular sealing member is sealingly engaged with said inner valve seat portion and, upon further advancement of said valve member, is elastically bent while maintaining the sealingly engagement to allow said valve member to reach the closed position while said annular extending portion remains outside said annular valve opening.

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