Title:
A SHUT-OFF VALVE
Document Type and Number:
WIPO Patent Application WO/2007/041892
Kind Code:
A1
Abstract:
A shut-off valve suitable for flowing the fluid with solid particle, especially with the granulae of crystal or polymer, is composed of a shut-off core, which rotates or moves along a line between an upstream passage and a downstream passage. The shut-off core is improved, wherein the length the core passes through becomes larger from a position the valve is completely closed to the other position the core opens initially the flow passage. So the annular seal surface, which seals with the valve seat on the upstream surface when the valve is closed, will not or less suffer from the erosion of the above said flow when the valve is shifted or throttled.
Inventors:
SONG YONGSHENG (CN)
Application Number:
PCT/CN2005/001650
Publication Date:
April 19, 2007
Filing Date:
October 08, 2005
Export Citation:
Assignee:
SONG YONGSHENG (CN)
International Classes:
F16K5/06
Foreign References:
CN2514183Y | 2002-10-02 | |||
US4212321A | 1980-07-15 | |||
US5524863A | 1996-06-11 | |||
CN2221694Y | 1996-03-06 |
Attorney, Agent or Firm:
SHANGHAI CONCORD PATENT AGENT CO., LTD. (No. 567 MaoTai RD, Shanghai 6, CN)
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