Protection of a seal element

Details Protection of a seal element Protection of a seal element

2008-07-22

2008-07-22

Rivell, John (Department: 3753)

Fluid handling

Systems

Flow path with serial valves and/or closures

C137S614000, C251S149600

Reexamination Certificate

active

07401627

ABSTRACT:
In accordance with the present invention, these and other problems in the prior art are addressed by providing a valve which comprises a valve body which includes an passage that extends at least partially therethrough, a valve seat which is formed in the passage, a valve member which is movably positioned in the passage proximate the valve seat, a first sealing element which is supported on the valve member and which in a closed position of the valve engages the valve seat to block fluid flow through the passage, and a protective member which is movable relative to the valve member between a first position in which the protective member substantially covers the first sealing element when the valve is in the open position and a second position in which the protective member is retracted from the first sealing element when the valve is in the closed position.

REFERENCES:
patent: 1047774 (1912-12-01), Eynon et al.
patent: 2829670 (1958-04-01), Nix
patent: 3464436 (1969-09-01), Bruning
patent: 5123448 (1992-06-01), Kjellberg et al.
patent: 5159955 (1992-11-01), Ekman
patent: 5732735 (1998-03-01), Birch
patent: 6082399 (2000-07-01), Nyberg
patent: 0 621 430 (1998-07-01), None

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