Coupling member of pipe coupling

• US 7,708,029 B2
• Filed: 06/27/2007
• Issued: 05/04/2010
• Est. Priority Date: 12/28/2004
• Status: Active Grant

• Current Assignee: Nitto Kohki Company Limited
• Original Assignee: Nitto Kohki Company Limited
• Inventors: Imaizumi, Masayuki, Kitagawa, Hiroyuki, Matsumoto, Koji
• Primary Examiner(s): Rivell; John
• Assistant Examiner(s): Price; Craig
• Application Number:
  US11/823,431
• Publication Number:
  US 20070246107A1
• Time in Patent Office: 1,042 Days
• Field of Search: 137/614.04, 137/614.03, 137/614.05, 277/584, 277/586, 277/587, 277/435, 277/641, 277/644, 251/149.1, 251/149.6, 251/359, 251/900
• US Class Current: 137/614.03
• CPC Class Codes: F16L 37/34 at least one of the lift valves being of the sleeve type, i.e. a sleeve is telescoped over an inner cylindrical wall
• CPC Class Codes: Y10T 137/87949 Linear motion of flow path sections operates both
• CPC Class Codes: Y10T 137/87957 Valves actuate each other

Abstract

A coupling member is provided that comprises a valve movable between a closed position and an opening position. The valve is provided with a seal ring fixed in an annular groove formed in the valve and urged against a valve seat in the closed position. The groove has a forward annular groove portion and a rear annular groove portion shallower than the forward annular groove portion. The seal ring has forward and rear annular seal portions fitted in the forward and rear annular groove portions, respectively. The rear ring portion has substantially the same diameter as the forward seal portion.

Claims

1. A coupling member of a pipe coupling having a male coupling member and a female coupling member that are couplable to each other;

the coupling member comprising;

a tubular member having a fluid passage, the tubular member having an annular valve seat surface formed so as to surround said fluid passage; and

an on-off valve provided in the fluid passage of the tubular member, the on-off valve being movable between a closed position where it is engaged under pressure with the annular valve seat surface to close the fluid passage and an open position where the on-off valve is displaced rearward in the axial direction of the fluid passage to separate from the annular valve seat surface, thereby opening the fluid passage;

the on-off valve comprising;

an annular valve surface located so as to face the annular valve seat surface when the on-off valve is in the closed position; and

a seal ring fitted and fixed in an annular groove formed circumferentially in the annular valve surface;

the annular groove comprising a stepped bottom surface which comprises a first surface bottom having a first diameter, a second bottom surface positioned rearward of the first bottom surface and having a second diameter greater than the first diameter, and an intermediate surface connecting the first and bottom surfaces;

the seal ring having a cross section complementary to a cross section of the annular groove and comprising a forward annular seal portion positioned on the first bottom surface and a rear annular seal portion position on the second bottom surface and contiguous with the forward annular seal portion, the rear annular portion having an outer diameter that is substantially same as that of the forward annular seal portion.