Title:
FLOW RATE CONTROL VALVE
Document Type and Number:
WIPO Patent Application WO/2004/072518
Kind Code:
A1
Abstract:
A flow rate control valve (1) has a first sleeve (4) and a second sleeve (5) that are fitted in an inner peripheral portion of a housing (3). Edge surfaces (4d, 5d) of both sleeves (4, 5) are in contact with each other with their positions radially shifted from each other. This forms coplanar circular step- portion end surfaces (4d’, 5d’), and an edge portion of the step portion end surfaces is a first seat portion (S1). The outer periphery of a valve body (6) is an inclined surface, which is a second seat portion (S2). A flow path of a gas passage (2) is closed when the second seat portion (S2) of the valve body (6) is in line-contact with the first seat portion (S1). In the above structure, seal leakage when a butterfly valve (7) is closed can be reduced in comparison with conventional structures.
Inventors:
NAKAMURA KATSUMI (JP)
Application Number:
PCT/JP2004/001523
Publication Date:
August 26, 2004
Filing Date:
February 13, 2004
Export Citation:
Assignee:
TAIHO KOGYO CO LTD (JP)
NAKAMURA KATSUMI (JP)
NAKAMURA KATSUMI (JP)
International Classes:
F02M25/07; F02D9/10; F16K1/226; (IPC1-7): F16K1/226
Foreign References:
| US6338467B1 | 2002-01-15 | |||
| JPS6124766Y2 | 1986-07-25 | |||
| JPH09329028A | 1997-12-22 | |||
| JP2001004038A | 2001-01-09 | |||
| JP3107705B2 | 2000-11-13 | |||
| JP2002054512A | 2002-02-20 | |||
| JPS5490523U | 1979-06-27 | |||
| JPH07151243A | 1995-06-13 |
Other References:
See also references of EP 1593887A4
Attorney, Agent or Firm:
Kanzaki, Shin'ichiro (Kyobashi 1-chome Chuo-k, Tokyo 31, JP)
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