Title:
SAFETY VALVE FOR PRESSURIZED SUPERFLUIDITY CRYOSTAT
Document Type and Number:
Japanese Patent JP3892249
Kind Code:
B2
Abstract:
PROBLEM TO BE SOLVED: To properly and easily inspect the opening state of a safety valve in a cryostat even when the pressurized super-fluidity cryostat is not cooled to ordinary operating temperature.
SOLUTION: The opening state of the safety valve 13 provided between a constantly fluid helium tank 2 and a pressurized super-fluidity helium tank 1 is inspected. Electrodes 20 and 22 are provided between the surface of a valve disc 14 forming the safety valve 13 and the surface of a valve seat 15 opposed thereto to measure an electrostatic capacity formed between these electrodes. Thus, a clearance dimension between the valve disc 14 and the valve seat 15 is obtained.
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Inventors:
Takashi Miki
Satoshi Ito
Satoshi Ito
Application Number:
JP2001180072A
Publication Date:
March 14, 2007
Filing Date:
June 14, 2001
Export Citation:
Assignee:
KABUSHIKI KAISHA KOBE SEIKO SHO
International Classes:
F25B9/02; G01B7/14; F16K37/00; F16K51/00; H01L39/04; (IPC1-7): F25B9/02; G01B7/14; H01L39/04; //F16K37/00; F16K51/00
Domestic Patent References:
| JP9148121A | ||||
| JP59014007U | ||||
| JP11144937A | ||||
| JP2000082244A | ||||
| JP2000018905A | ||||
| JP4044308A | ||||
| JP7198309A | ||||
| JP2000145997A | ||||
| JP53107354A |
Foreign References:
| US5220800 |
Attorney, Agent or Firm:
Etsushi Kotani
Kyuichi Ueki
Muramatsu Toshiro
Kyuichi Ueki
Muramatsu Toshiro
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