Flow restriction detector for a nozzle assembly

Details Flow restriction detector for a nozzle assembly Flow restriction detector for a nozzle assembly

1995-04-05

1996-07-23

Williams, Hezron E.

Measuring and testing

With fluid pressure

Dimension, shape, or size

222 23, 137557, G01N 1900

Patent

active

055378560

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.

REFERENCES:
patent: 4430886 (1984-02-01), Rood
patent: 5040579 (1991-08-01), Kawamura
patent: 5092161 (1992-03-01), Jenkins

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