Title:
STEM SEAL
Document Type and Number:
WIPO Patent Application WO/2007/022721
Kind Code:
A1
Abstract:
A stem seal using triangle-sectional sleeve as a cylinder seal or a stem seal using a coupling set of spherical wedge/socket as a shoulder seal could endure solely the bursting pressure test without leaking. The section of said sleeve is triangle, and it is a triangle with a top-truncation when existing wear and assembling squeeze allowance, while it is a real triangle when not existing wear and assembling squeeze allowance. The coupling set of spherical wedge/socket is a set using spherical wedge as a stem shoulder and using spherical socket as a stem seat.
Inventors:
XU CHANGXIANG (CN)
Application Number:
PCT/CN2006/002156
Publication Date:
March 01, 2007
Filing Date:
August 23, 2006
Export Citation:
Assignee:
ZHEJIANG CHINA VALVE CO LTD (CN)
XU CHANGXIANG (CN)
XU CHANGXIANG (CN)
International Classes:
F16K41/04
Foreign References:
| CN2512960Y | 2002-09-25 | |||
| CN1447054A | 2003-10-08 | |||
| CN1475687A | 2004-02-18 | |||
| CN1245874A | 2000-03-01 | |||
| US6129336A | 2000-10-10 | |||
| CN1227321A | 1999-09-01 | |||
| JP2002061760A | 2002-02-28 |
Attorney, Agent or Firm:
CHINA TRADEMARK & PATENT LAW OFFICE CO., LTD. (Yuexin Bld. 14, Yuetannanji, Xichengqu Beijing 5, CN)
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