초록 ▼

A seal for coupling or valve assemblies employing flapper valves or the like has two axially and radially offset annular sealing members that are integrally joined by a relatively thin folding web section that provides the necessary flexibility to the seal. The radially outer sealing member is adapt

A seal for coupling or valve assemblies employing flapper valves or the like has two axially and radially offset annular sealing members that are integrally joined by a relatively thin folding web section that provides the necessary flexibility to the seal. The radially outer sealing member is adapted to be clamped by a valve plate to the coupling or valve assembly housing to provide a first static seal surrounding the flow passage in the housing, whereas the radially inner sealing member essentially floats at the axial inner end of the web. The radially inner sealing member is adapted to be engaged by the flapper valve when moved to the closed position to provide a second static seal at the flapper valve face preventing flow through the coupling or valve assembly in either direction. Due to the flexibility of the seal, the sealing member will take up any small amount of tolerance conditions and will follow the location and contour of the flapper valve to provide the required sealing function under adverse tolerance conditions.

대표청구항 ▼

A coupling or the like comprising a housing having a passage therein, an annular seal in said housing surrounding said passage, said seal including two radially and axially offset annular sealing members and a relatively long annular folding web integrally joining said sealing members, said web havi

A coupling or the like comprising a housing having a passage therein, an annular seal in said housing surrounding said passage, said seal including two radially and axially offset annular sealing members and a relatively long annular folding web integrally joining said sealing members, said web having radially inner and outer parallel surfaces which when in the relaxed condition are inclined to the axis of said seal, said sealing members being substantially circular in cross-sectional shape, the radially outer surface of said web at its radially inner end forming a substantially straight tangential continuation of the curved outer surface of the radially inner one of said sealing members, means for retaining the radially outer one of said sealing members in sealed engagement with said housing, and valve means movable into sealing engagement with said radially inner sealing member for closing said passage, said valve means having a substantially flat radially extending sealing surface, said web folding upon itself when said radially inner sealing member is engaged by said sealing surface of said valve means to cause the radially outer surface of said web at its radially inner end and said radially inner sealing member to remain in sealing engagement with said sealing surface of said valve means while accommodating any adverse tolerance conditions.