TOP ENTRY PLASTIC BALL VALVE

WIPO Patent Application WO/2010/148583

A1

A top entry plastic ball valve comprises a valve stem cap (1), a valve stem (2), a valve stem sealing ring (3), a valve ball sealing ring (5), a supporting ring (6) for the valve ball sealing ring, a valve ball (7), a connecting pipe (8), and a valve body (9). A hollow valve ball chamber (911) is provided inside the valve body (9), the valve body (9) is provided with a valve cover hole (912) just above the valve ball chamber (911), and a width of the valve cover hole (912) is larger than a diameter of the valve ball (7). The ball valve also comprises a valve cover (4), which is provided with a valve stem axial hole (410) for allowing the valve stem (2) to pass through and corresponds to the valve cover hole (912) so that the valve cover (4) can cover the valve cover hole (912) and can be fusion-bonded to the valve body (9), thereby avoiding the need of the electric fusion welding process in the manufacture of the large-caliber ball valve.

YANG JIYUE (CN)
HUANG HONGBIN (CN)

PCT/CN2009/073416

December 29, 2010

August 21, 2009

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GUANGDONG LIANSU TECH IND CO (CN)
YANG JIYUE (CN)
HUANG HONGBIN (CN)

F16K5/06; F16K27/06; F16K27/12; F16L47/02

CN1141404A	1997-01-29
FR2687754A1	1993-08-27
CN1285848C	2006-11-22
CN201096208Y	2008-08-06
US4072161A	1978-02-07
JPH0960739A	1997-03-04
CN2644803Y	2004-09-29
JPH10213248A	1998-08-11
CN2061233U	1990-08-29
US5396922A	1995-03-14
CN1043074C	1999-04-21

YOGO PATENT & TRADE MARK AGENCY LIMITED COMPANY (Block B Sinopec Tower,Tiyuxi Road, Tianhe Distric, Guangzhou Guangdong 0, CN)

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