Fluid measuring and metering system - is used in paint sprayer and performs dynamic flow measuring to control mixing valve

摘要

A system is used for accurately mixing two or more liquids and for dispensing the mixture. The system is generally adapted for use in paint spraying operations. The flow of one of the components is accurately measured by means of a flow meter and the measured value provides a signal to control a valve which, in turn, controls the flow of the other liquid. Periodically the volume of the first mentioned liquid is measured for a given time period so as to make necessary adjustments in the flow meter-value interconnection. An arrangement is provided for purging a mixing manifold immediately prior to the completion of the dispensing cycle to that none of the mixture will be wasted. The control arrangement includes air operated two and three-way valves.