IMPULSE-LIKE FLOW CHANGE PRODUCTION DEVICE

Japanese Patent JP3328006

B2

PURPOSE: To exactly grasp pipe inside pulse characteristics with a gs reservoir of a specified volume, a pressurizing gas introduction means, a valve means for discharging gas in form of an impulse and a means for finding a gas flow history.
CONSTITUTION: When a supply valve 4 is opened and the inside of a gas reservoir 1 reaches initial pressure, the valve 4 is closed. When a valve opening lever 11 is quickly turned under the condition where a discharge opening 5 is connected to piping and the like, the lever 11 overcomes a compression coil spring 9, lifts an valve opening claw 10 in a short time and is separated from the claw 10. Thereby, a stem 7 is lifted and a discharge valve 6 is opened. When the claw 10 is separated from the lever 11, the stem 7 quickly closes the valve 6 by force of the spring 9. As a result, since pressure of the gas reservoir 1 is lowered stepwise from the initial pressure to the pressure after release, a rate of pressure change in which it is differentially processed and gotten is in the form of a pulse. This signal has direct correlation with the flow discharged from the discharge opening 5, this is symbol-inverted, specified factor multiplication processing is performed and an impulse flow of gas which is allowed to flow in the discharge opening 5 can be found.

Shinji Hayama
Hiroyuki Matsuda

JP15631193A

September 24, 2002

June 03, 1993

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Chiyoda Kakoh Construction Co., Ltd.

G01L11/00; G01L11/04; G01M7/02; G01M99/00; G01F15/06; (IPC1-7): G01F15/06; G01L11/04; G01M7/02; G01M19/00

JP6347320A
JP5382454A

Youichi Ohshima

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