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US 2008/0066816 A1Published application
Automatic stop cock valve
AssigneeAlcon Inc.
InventorsDennis L. Steppe, John C. Huculak, Robert J. Sanchez
Life of this patent
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Abstract
A flow control device includes a fitting having three portals. One of the portals is an entry portal for a liquid, one of the portals is an entry portal for a gas, and the other portal is an exit portal for either the liquid or the gas. A normally closed back flow prevention valve is located in fitting. The back flow prevention valve prevents back flow of liquid through the fitting. The fitting and the backflow prevention valve also minimize or eliminate the formation of air bubbles in the liquid.
Claims4
A flow control system, comprising:
- a source for the flow of a first fluid;
- a source for the flow of a second fluid;
- means for switching between said flow of said first fluid and said flow of said second fluid;
- a first line for said flow of said first fluid;
- a second line for said flow of said second fluid;
- and
- a fitting comprising:
- a first entry portal for said first line;
- a second entry portal for said second line;
- an exit portal for either said first fluid or said second fluid;
- a normally closed backflow prevention valve, said backflow prevention valve capable of being opened when said means for switching switches said flow of said first fluid to said flow of said second fluid;
- and
- a receptacle having an internal surface closely mating with an external surface of said backflow prevention valve so as to minimize a gap volume between said receptacle and said external surface.
10 more elements
Dependencies are inferred from the claim text.