Patent ID: 6871837
Filing Date: 2005-03-29
Classification: F16L,Y10S,Y10T

Abstract:
1. A valve provided in a fluid passage of a coupler of a pipe coupling such that said valve is movable in an axial direction of said fluid passage, said valve comprising: an exterior surface including an annular surface corresponding to an annular valve seat formed in an interior surface of said coupler defining said fluid passage; an annular groove formed in said annular surface; an annular sealing ring disposed in said annular groove; and, a communication passage extending from a bottom portion of said annular groove, or a vicinity thereof, through said exterior surface; wherein said valve is axially movable in said fluid passage between a closing position where said annular sealing ring is engaged with said annular valve seat to close said fluid passage, and an opening position where said annular sealing ring is disengaged from said annular valve seat to open said fluid passage, and said communication passage extends from said bottom portion of said annular groove, or said vicinity thereof, along a side wall surface of said annular groove to form an elongated side groove extending along said wall surface and between said bottom portion of said annular groove, or said vicinity thereof, and said annular surface.