A FLUID CONTROL VALVE FOR PIG

WIPO Patent Application WO/2000/070250

A1

The invention discloses a fluid control valve for pig, including a main valve (1) and operating means. The main valve comprises a valve body (2) communicated to a fluid pipe (3), a main valve core movably disposed in the inner chamber of the valve body, and a main valve stem (5) connected to the main valve core. The operating means includes a hydrocylinder (6), which comprises a piston (7) disposed in the cylinder, and a piston rod (8) connected to the piston, and wherein the piston rod being transmissibly connected with the main valve stem (5), so as to drive the main valve core to move by the main valve stem; a valve device including a pilot valve (11, 56) positioned in the pipeline which communicates the fluid pipe with the hydrocylinder; and an operator for controlling the actuation of the pilot valve, so as to enable the piston to move reciprocally by the pressure of fluid in the fluid pipe (3).

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ZENG XIANGWEI (CN)

PCT/CN2000/000114

November 23, 2000

May 12, 2000

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ZENG XIANGWEI (CN)

B08B9/04; F16L55/26; (IPC1-7): F16K31/124; F16K51/00; F16L55/26; B08B9/057

CN1102601A	1995-05-17
CN2356202Y	1999-12-29
CN2293690Y	1998-10-07
GB2317430A	1998-03-25
DE2113788A1	1972-10-05

LIU, SHEN & ASSOCIATES (Huibin Building No. 8 Beichen Dong Stree, Chaoyang District Beijing 1, CN)

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