Rolling diaphragm injection pump
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United States of America Patent
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Feb 9, 1993
Grant Date -
N/A
app pub date -
Mar 8, 1991
filing date -
Mar 8, 1991
priority date (Note) -
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Abstract
An additive injection pump has a rolling diaphragm mounted between a reciprocable assembly and a cylinder to create a secondary fluid pumping chamber in the lower end of the cylinder. The reciprocable assembly has an internal one-way flow passage between the pumping chamber and an opposite end portion of the assembly having an outlet. The selective positioning of a valve member at the bottom of the reciprocable assembly establishes a predetermined quantity of secondary fluid supplied through an inlet at the bottom of the cylinder. When the cylinder is attached to a housing having a primary fluid stream and the assembly is reciprocated by a fluid motor in the housing, secondary fluid in predetermined doses is injected into the primary fluid stream.
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