Positive displacement piston flow meter for air flow measurement
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United States of America Patent
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-
Mar 22, 1994
Issued Date -
N/A
app pub date -
Jul 28, 1993
filing date -
May 29, 1991
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A positive displacement piston flow meter for measuring air flow comprising a hollow flowtube, preferably arranged in a vertical orientation, having a movable piston disposed in the flowtube for movement between a starting position, preferably at the bottom end of the piston stroke, and an elevated position at the top end of the piston stroke. The piston is reciprocated by means of a pressure relief control valve assembly which controls the ascent and descent of the piston. The piston is physically connected to the pressure relief control valve assembly by means of a flexible string, which causes the piston to automatically close the valve assembly for automatic operation on reaching the bottom end of the piston stroke and to reverse direction.
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