Filling valve for counterpressure filling of cans
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United States of America Patent
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-
Jan 22, 1991
Issued Date -
N/A
app pub date -
Nov 8, 1989
filing date -
Nov 27, 1981
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
Counterpressure valves for filling cans with liquids under pressure such as carbonated beverages are disclosed. In a preferred embodiment, the present invention provides a filing valve in which the seal between the valve and a can is created by an O-ring seal disposed about a valve member. Preferably, two concentric, axially-spaced O-rings are used; a first o-ring serves as a guide, while the second, slightly larger O-ring creates a seal. Since the sealing O-ring may be moved axially along the can to permit the head space volume to expand, the need for a snift valve or similar relief valve is eliminated. Sealing valves utilizing radially expandable gaskets are also disclosed. In these embodiments, the gasket expand radially under counterpressure to form a seal with the inner surface of the can.
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