Title:
STEAM VALVE AND SHAFT SEAL DEVICE
Document Type and Number:
Japanese Patent JP2011122503
Kind Code:
A
Abstract:
To provide a steam valve inhibiting steam leaking from a gap between a valve rod and a guide bush from rapidly expanding and preventing erosion of the valve rod by the leaked steam.
A plurality of labyrinth grooves 32a to 32e in a circumferential direction are formed in the inner peripheral face of the guide bush 30 and each of the labyrinth grooves 32a to 32e is arranged to gradually expand as it approaches a discharge chamber 18.
Inventors:
NAKAMURA TAKANORI
ISHIZUKA NORIKI
ISHIZUKA NORIKI
Application Number:
JP2009280320A
Publication Date:
June 23, 2011
Filing Date:
December 10, 2009
Export Citation:
Assignee:
TOSHIBA CORP
TOSHIBA AITEKKU KK
TOSHIBA AITEKKU KK
International Classes:
F01D17/10; F01D25/00; F16J15/447; F16K1/32; F16K41/04; F16K47/02; F16K47/08
Domestic Patent References:
JPS5631602U | 1981-03-27 | |||
JP2005325750A | 2005-11-24 | |||
JP2001123803A | 2001-05-08 | |||
JPS6154558U | 1986-04-12 | |||
JPS5631602U | 1981-03-27 | |||
JP2005325750A | 2005-11-24 | |||
JP2001123803A | 2001-05-08 | |||
JPS6154558U | 1986-04-12 |
Foreign References:
US2550418A | 1951-04-24 | |||
US2550418A | 1951-04-24 |
Attorney, Agent or Firm:
Kenji Yoshitake
Hirohito Katsunuma
Hiroyuki Nagai
Junpei Okada
Katsuomi Isogai
Hirohito Katsunuma
Hiroyuki Nagai
Junpei Okada
Katsuomi Isogai
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