Title:
VALVE DEVICE AND PIPELINE SYSTEM
Document Type and Number:
WIPO Patent Application WO/2002/012766
Kind Code:
A1
Abstract:
A valve device which ensures reliable opening/closing control of pipeline and a stabilized operation such that even when valve opening/closing operation is quickly effected, water hammering, chattering, hunting or the like hardly occurs immediately before valve closing or at the instant of valve opening; and a pipeline system. A valve device having a valve disk adapted to move away from and into contact with a valve seat to open/close a flow path, characterized the mutually associated closure surface regions of the valve disk and valve seat are provided with uneven portions adapted to fitted to each other with a predetermined clearance therebetween in the final stage of valve closing stroke, and the flow path of the clearance between the uneven portions fitted to each other is formed having a shape to bend the direction of travel of the flowing fluid to increase the resistance loss; and a pipeline system characterized by having such valve device inserted therein.
Inventors:
YOKOTA HIROSHI (JP)
YOKOTA SHINGO (JP)
YOKOTA SHINGO (JP)
Application Number:
PCT/JP2001/006828
Publication Date:
February 14, 2002
Filing Date:
August 08, 2001
Export Citation:
Assignee:
YOKOTA MFG (JP)
YOKOTA HIROSHI (JP)
YOKOTA SHINGO (JP)
YOKOTA HIROSHI (JP)
YOKOTA SHINGO (JP)
International Classes:
F16K1/36; F16K1/42; F16K47/02; (IPC1-7): F16K47/02; F16K1/36; F16K1/42
Foreign References:
| JPS5455819A | 1979-05-04 | |||
| JPH02186171A | 1990-07-20 | |||
| JPH0581570U | 1993-11-05 | |||
| JPS5064815A | 1975-06-02 | |||
| JPS521630A | 1977-01-07 | |||
| JPH11325310A | 1999-11-26 | |||
| JPS391643B1 | 1964-02-19 | |||
| JPS5594064A | 1980-07-17 |
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