Valves and valve actuation – With correlated flow path – Valve operated by joining flow path sections
Reexamination Certificate
2002-05-28
2003-12-30
Lee, Kevin (Department: 3753)
Valves and valve actuation
With correlated flow path
Valve operated by joining flow path sections
C137S614030, C137S614040
Reexamination Certificate
active
06669168
ABSTRACT:
TECHNICAL FIELD OF THE INVENTION
The present invention relates to quick connect tube couplings. More particularly, the invention relates to a quick connect tube coupling that utilizes fewer seals and is easier to manufacture.
BACKGROUND OF THE INVENTION
Quick connect tube couplings are well known in the art. One type of quick connect tube coupling that has found substantial commercial success is disclosed in U.S. Pat. No. 4,378,028, the entire disclosure of which is fully incorporated herein by reference. The present invention is directed to improvements in the coupling described therein to reduce the number of seals and sealing surfaces, thereby simplifying manufacturing processes and reducing costs without any compromise in performance of the coupling.
SUMMARY OF THE INVENTION
In accordance with one aspect of the invention, a quick connect coupling includes a valve seat member that has only two seals for providing a body seal against fluid pressure. In one embodiment, the valve seat member includes an outer surface with a seal groove therein and an inner surface with a seal groove therein. The seals are radially compressed within these seal grooves. Reducing the number of seals and seal surfaces simplifies manufacturing and thereby lowers cost.
In accordance with another aspect of the invention, a valve seat member is provided that seals against fluid pressure in such a way that a body extension of the female coupling component is not a wetted part. In one embodiment, an inner seal seals against an outer surface of a tubular stem portion of the male coupling member, and an outer seal seals against an inner surface of the female coupling body.
REFERENCES:
patent: 4378028 (1983-03-01), Weber et al.
patent: 5215122 (1993-06-01), Rogers et al.
patent: 5445358 (1995-08-01), Anderson
patent: 1214691 (1960-04-01), None
patent: 898955 (1962-06-01), None
Calfee Halter & Griswold LLP
Lee Kevin
Swagelok Company
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