Flow restriction detector for a nozzle assembly
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United States of America Patent
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-
Jul 23, 1996
Grant Date -
N/A
app pub date -
Apr 5, 1995
filing date -
Apr 5, 1995
priority date (Note) -
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status (Latency Note)
Importance
Abstract
A flow restriction detector for a nozzle assembly of a liquid dispensing machine is capable of detecting a blocked or partially blocked nozzle during the cleaning of the nozzle assembly. During nozzle cleaning, a return plate is attached to the nozzle plate of the nozzle assembly to receive a flow of pressurized fluid from the nozzles. Both the inlet and return fluid lines are provided with pressure sensors, and the return line has a constant back pressure applied to it so that the differential between the inlet and return line pressure sensors is in the range 5-10 psi. The pressure differential is monitored during cleaning and from one cleaning to the next for the purpose of identifying a blocked or partially blocked nozzle. A change of as little as 5% from the pressure differential value established for an unblocked system may indicate a partial blockage of a nozzle.
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Cited Art Landscape
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