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Liquified Gas Dispenser

IP.com Disclosure Number: IPCOM000095720D
Original Publication Date: 1964-May-01
Included in the Prior Art Database: 2005-Mar-07
Document File: 2 page(s) / 71K

Publishing Venue

IBM

Related People

Bryant, GJ: AUTHOR [+2]

Abstract

This dispensing apparatus supplies liquified nitrogen on demand from an insulated supply flask 10 to a utilization container 11, such as the cold trap of a high vacuum system.

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Liquified Gas Dispenser

This dispensing apparatus supplies liquified nitrogen on demand from an insulated supply flask 10 to a utilization container 11, such as the cold trap of a high vacuum system.

Heat transmission through the walls of flask 10 causes continuous evaporation of the stored nitrogen. Normally, the vaporized gas is allowed to escape through vent 12. Valve 13, controlled by float 14 in container 11, closes vent 12 whenever the liquid level in container 11 drops below a preset minimum. The consequent increase of vapor pressure in flask 10 forces liquified gas through outlet pipe 15 to container 11.

To prevent continual metering of minor amounts of nitrogen in response to oscillation of float 14 around the minimum level, a delay reservoir 16 is provided on float 14 to receive liquid from pipe 15. Liquid from pipe 15 flows into and fills reservoir 16 before overflowing into container 11 and buoying up float 14 to open vent 12. A small aperture 17 allows the liquid in reservoir 16 to escape slowly into container 11 to maintain the liquid level as the nitrogen is used up. Escape of liquid from reservoir 16 also lightens float 14 and permits it to float higher in the container. Only when reservoir 16 is empty and the liquid level falls below the minimum level necessary to support lightened float 14 is there a new transference of nitrogen from flask 10.

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