Receptacles – Closures – With condition responsive vent or valve
Patent
1978-03-01
1980-10-21
Garris, Bradley R.
Receptacles
Closures
With condition responsive vent or valve
206 15, 206438, 2065248, 215260, 220209, 422110, 422111, 422112, 422295, 422310, A61B 1902, A61L 206, A61L 226, B65D 8120
Patent
active
042289149
ABSTRACT:
A container is disclosed with a valve opening at its bottom wall to permit steam to circulate into the container and to permit any condensation to drain from the container while the valve is open. The valve is closed by an expandable chamber in response to the pressure drop at the end of a sterilizing cycle. A valve controlling the flow of steam into the expandable chamber closes when subjected to the high temperature steam, thus capturing steam within the chamber. This steam expands when the pressure drops to close the valve in the container. The container lid and gasket permit steam to be withdrawn from the container but prevent air flow into the container. A vacuum created in the container at the end of the sterilizing cycle holds the container lid in place and holds the valve closed.
Also disclosed is a bimetallic spring valve which opens when steam is applied to a container and closes when the temperature drops as steaming ceases. The valve is biased closed at reduced temperature but opens when a vacuum is applied to the container exterior, thus permitting water vapor to be withdrawn.
REFERENCES:
patent: 2024511 (1935-12-01), Darling
patent: 2092445 (1937-09-01), Doulgheridis
patent: 2097585 (1937-11-01), Carson
patent: 2489989 (1949-11-01), Totman
patent: 2997397 (1961-08-01), Doulgheridis
patent: 3061196 (1962-10-01), Bauerlein
patent: 3468471 (1969-09-01), Linder
patent: 4051973 (1977-10-01), Botkin
patent: 4105407 (1978-08-01), Sanderson
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