Fluid flow measuring device
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United States of America Patent
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-
Oct 12, 1993
Grant Date -
N/A
app pub date -
Oct 22, 1991
filing date -
Oct 22, 1991
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A fluid flow measuring device having a positive displacement piston in a precise bore glass flowtube, with flexible diaphragms at opposite ends of the flowtube, to seal the flowtube from the ambient environment. The flowtube is filled with a pure fluid or gas for uncontaminated operation of the piston. Movement of the piston within the sealed flowtube is controlled by controlling the movement of each diaphragm. The diaphragms are supported in a housing connected to each opposite end of the flowtube, with a plenum chamber in communication with each diaphragm, and with means for the ingress and egress of the fluid under flow measurement with the plenum chamber.
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