Title:
METHOD AND APPARATUS FOR SHIELDING A VALVE GATE AND OTHER VALVE PARTS
Document Type and Number:
WIPO Patent Application WO2001081800
Kind Code:
B1
Abstract:
A method and apparatus for shielding a valve gate (3B) from potentially harmful environmental conditions. A valve gate can be moved from a closed position, in which the valve gate closes a valve passage (11) and is potentially exposed to harmful environmental conditions, to a retracted position, in which the valve gate is shielded from the harmful environmental conditions. For example, the valve gate can be retracted inside a housing (51) and a door (63) can be closed over and opening (62, 67) in the housing to protect the valve gate. Other portions of the valve (100), such as a valve seat (2), can also be protected from harmful conditions, e.g., by closing a valve seat opening to prevent substances or other environmental conditions form leaving the valve passage.
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Inventors:
BOTELHO JAMES
KLOS LEO V
KLOS LEO V
Application Number:
PCT/US2001/012018
Publication Date:
March 28, 2002
Filing Date:
April 12, 2001
Export Citation:
Assignee:
VARIAN SEMICONDUCTOR EQUIPMENT (US)
International Classes:
A61M39/00; F16K3/02; F16K51/02; (IPC1-7): F16K51/02; F16K3/02
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