Title:
寒剤の使用を制限する凍結融解バルブ
Document Type and Number:
Japanese Patent JP4053042
Kind Code:
B2
Abstract:
Methods and devices for the management of cryogenic agents within analytical systems using freeze thaw valving having an expansion chamber that limits the flow of the cryogenic agent. The expansion chamber is fitted with an expansion nozzle through which a cryogen flows and a porous frit that allows the cryogen to be exhausted. The porous frit initially allows a rapid flow of cryogen into the expansion chamber. This rapid flow lowers the temperature of the expansion chamber causing fluid contents within a freeze thaw segment to freeze. As the cryogen expands into the expansion chamber and turns into a solid, the porous frit is occluded causing the rapid flow to be restricted. The restriction of the cryogen flow by the occlusion of the porous frit allows the freeze thaw valve to use significantly less cryogen. Sublimation of the cryogen trapped within the porous frit provides sufficient cooling to maintain the valve in its closed position.
Inventors:
Gerhard, Jeff See
Droudville, Theodore
Droudville, Theodore
Application Number:
JP2004536333A
Publication Date:
February 27, 2008
Filing Date:
September 15, 2003
Export Citation:
Assignee:
Waters Investments Limited
International Classes:
G01N1/28; F16K13/10; F16K31/00; G01N37/00
Domestic Patent References:
| JP9502517A | ||||
| JP2134480A | ||||
| JP553585A |
Foreign References:
| US6387234 | ||||
| US6342184 |
Attorney, Agent or Firm:
Yoshio Kawaguchi
Makoto Ono
Katsuma Osaki
Mitsuaki Tsubokura
Makoto Ono
Katsuma Osaki
Mitsuaki Tsubokura