Variable gate flow analyzing method and apparatus
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United States of America Patent
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Jan 4, 1994
Grant Date -
N/A
app pub date -
Oct 4, 1990
filing date -
Oct 4, 1990
priority date (Note) -
Expired
status (Latency Note)
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Abstract
To measure flow rates, the cross-sectional shape of the flow path is changed by inserting a multiple position gate into the flow path and altering the position of the gate to maintain the head of liquid constant with a reduced flow cross section. To maintain the head at a desirable range, the depth is measured and controls the position of the gate as a feedback signal. The position of the multiple position gate is correlated with the depth to provide an indication of flow rate. For this purpose, a flow path housing is clamped to a pipe and a multiple position gate is moved by pneumatic pressure into the flow stream to change the flow cross section. The depth of the head upstream of the gate is measured and the position of the gate is measured. Flow rate is determined from these two measurements. Sampling may be performed at an increased depth caused by the gate.
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