Liquid cryogen withdrawal device

Details Liquid cryogen withdrawal device Liquid cryogen withdrawal device

1994-10-06

1996-02-06

Capossela, Ronald C.

Refrigeration

Storage of solidified or liquified gas

With vapor discharged from storage receptacle

62 502, F17C 704

Patent

active

054888310

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. 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; the withdrawal device has a passive heat source (18) disposed at the bottom thereof to cause sufficient boiling of the liquid to create enough pressure to force a suitable amount of liquid from the dewar. The plug may have a handle and a gas pressure relief valve disposed thereon.

REFERENCES:
patent: 3750414 (1973-08-01), Heftman
patent: 4091634 (1978-05-01), Shepherd
patent: 4279626 (1981-07-01), Buchmuller et al.
patent: 4299091 (1981-11-01), Carter et al.
patent: 4313306 (1982-02-01), Torre
patent: 4608831 (1986-09-01), Gustafson

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