METHOD FOR CLOSING FLUID PASSAGE, WATER HAMMERLESS VALVE AND WATER HAMMERLESS CLOSING DEVICE

Title:

METHOD FOR CLOSING FLUID PASSAGE, WATER HAMMERLESS VALVE AND WATER HAMMERLESS CLOSING DEVICE

Document Type and Number:

WIPO Patent Application WO/2004/057432

Kind Code:

A1

Abstract:

A fluid passage is emergency-closed in a short time without causing water hammer by extremely simple device or operation. A water hammerless closing device comprises an actuator-operated valve provided in the fluid passage and an electro-pneumatic converter for supplying a two-step actuator working pressure Pa to the actuator-operated valve, a vibration sensor secured removably to the upstream-side pipe-line of the actuator-operated action valve, and a tuning box receiving a vibration detection signal Pr from the vibration sensor and delivering a control signal Sc for controlling the magnitude of the step working pressure Ps’ of the two-step actuator working pressure Pa to the electro-pneumatic converter, and regulating the control signal Sc to deliver the two-step actuator working pressure Pa of the step working pressure Ps’ for bringing the vibration detection signal Pr substantially to zero from the electro-pneumatic converter.

Inventors:

OHMI TADAHIRO (JP)
IKEDA NOBUKAZU (JP)
NISHINO KOUJI (JP)
NAGASE MASAAKI (JP)
DOHI RYOUSUKE (JP)
NISHIMURA RYUTARO (JP)

Application Number:

PCT/JP2003/016287

Publication Date:

July 08, 2004

Filing Date:

December 18, 2003

Export Citation:

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Assignee:

FUJIKIN KK (JP)
OHMI TADAHIRO (JP)
IKEDA NOBUKAZU (JP)
NISHINO KOUJI (JP)
NAGASE MASAAKI (JP)
DOHI RYOUSUKE (JP)
NISHIMURA RYUTARO (JP)

International Classes:

F16K47/02; F16L55/04; (IPC1-7): G05D16/02

Foreign References:

JPH1182763A	1999-03-26
JPS5945378U	1984-03-26
JPS55119923U	1980-08-25

Other References: