Effervescent gas bleeder apparatus
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United States of America Patent
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-
Feb 13, 2007
Grant Date -
Apr 1, 2004
app pub date -
Apr 10, 2003
filing date -
Sep 27, 2002
priority date (Note) -
In Force
status (Latency Note)
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Abstract
A diaphragm metering pump suitable for metering an effervescent gas. The pump has a pump head with a product chamber having an inlet end with a one-way inlet valve and an outlet end with a one-way outlet valve. A displaceable diaphragm member defines a boundary of the product chamber. The diaphragm member is capable of being reciprocated to cause pumping displacements. A discharge side is disposed downstream from the outlet valve. A passageway is disposed in fluid communication between the discharge side and the product chamber. A valve is disposed in the passageway. The valve is opened intermittently to allow liquid to re-enter the product chamber in an amount effective to purge gas from the product chamber to prevent loss of prime.
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