PERISTALTIC LIQUID METERING PUMP Russian patent published in 1999 - IPC

FIELD: precise metering of liquids with enhanced purity requirements and limitations for thermal, electromagnetic and other effects. SUBSTANCE: invention is aimed at minimization of accompanying effects of metering pump on metered liquid, at exclusion of parts in structure of metering pump moving in metered liquid in process of its operation, at reduced errors in periods of issue and mass of doses thanks to simplification of structure controlling metering process. Peristaltic liquid metering pump has working vessel with inlet and outlet unions. Outlet union is manufactured in the form of separable spinneret which has at least one metering hole of specified diameter with shut-off unit. Upper part of working vessel communicates with atmosphere through union shut by low flow rate valve and inlet union also carries valve. EFFECT: minimization of accompanying effects of metering pump on metered liquid. 2 dwg