Liquid cryogen withdrawal device with pump

Details Liquid cryogen withdrawal device with pump Liquid cryogen withdrawal device with pump

1998-07-07

2000-03-14

Capossela, Ronald

Refrigeration

Storage of solidified or liquified gas

Liquified gas transferred as liquid

62293, 222209, F17C 702

Patent

active

060356464

ABSTRACT:
A liquid cryogen withdrawal device includes a plug (14) for insertion into the neck of a cryogen-containing dewar (10) in gas-tight relationship. A withdrawal tube (17) passes through the plug to conduct liquid from the bottom of the dewar through a sintered bronze filter to a container to be filled with cryogen, and a pressure tube (19) fitted with a pump (20). Cryogen is stored in the dewar with a loose fitting cap thereon, with no withdrawal device in the dewar. When liquid is desired to be retrieved from the dewar, the withdrawal device is inserted into the dewar; and the pump is operated to create enough pressure to force a suitable amount of liquid from the dewar. The plug may have a gas pressure relief valve disposed thereon.

REFERENCES:
patent: 2202079 (1940-05-01), Ayres
patent: 2996893 (1961-03-01), Goodenough et al.
patent: 3323689 (1967-06-01), Elmore
patent: 3823718 (1974-07-01), Tromovitch
patent: 4091634 (1978-05-01), Shepherd
patent: 4622889 (1986-11-01), Chappell et al.
patent: 5488831 (1996-02-01), Griswold

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