Volumetric dosage control appts. for use in petrol industry - uses pressure differential created across nozzle to draw electronically regulated quantities of liquid into main flow

摘要

The dosage measuring device comprises a nozzle (A,B,C) traversed by a fluid flow. This provides using the venturi effect, the pressure differential which injects (P1) the second fluid into the first through a volumetric dosage control. A valve permits admission to the dosage control, then injection of the second fluid into the first fluid. An automatic device operates in synchronism with a regulator tap (R) to obtain an integral number of injections in a predetermined mix volume. The number of complete injections are memorised and a predetermined total fluid volume counted to provide control and measurement of the concentration of the second fluid. USE - Precise control of additives in small proportions, particularly for chemical and petroleum industries.