Electronic proportioner using continuous metering and correction

摘要

The controller of the plural component proportioner ( 10 ) dispenses both components (or all three if a three component material) simultaneously (at least initially) and maintains ratio at the end of each predetermined volume of material by determining which component pump ( 12 ) has reached the desired amount of travel (given the resolution available) and using a valve ( 16 ) to shut off output of that pump until the other side has caught up. At pump changeover, the output valve for that pump ( 12 ) is shut off and the air motor ( 12 a) allowed to run until travel stops to account for cavitation, air entertainment, compressibility, or poor inlet check performance.