Apparatus for controlling diaphragm extension in a diaphragm metering pump
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United States of America Patent
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-
Oct 5, 1993
Grant Date -
N/A
app pub date -
Oct 7, 1991
filing date -
Oct 7, 1991
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A diaphragm metering pump having control over diaphragm extension is described. A position sensor is incorporated in a diaphragm metering pump to indicate the relative position of the diaphragm during flexure. When excessive extension of the diaphragm is sensed by the position sensor, a control valve will provide hydraulic fluid from a reservoir for inhibiting further deflection of the diaphragm in the direction in which it was moving. Diaphragm life is extended as well as the accuracy of metering provided by the pump maintained.
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