Ultimate metering accuracy
Published: 26 January, 2018
HYDRA-CELL Metering pumps are said to enable users to meet or exceed API 675 performance standards with virtually pulse-less, linear flow. The company says these pumps achieve superior levels of accuracy, repeatability and linearity, while delivering precise, constant flow by employing unique hydraulic oil management systems.To maintain accuracy in a hydraulically-actuated metering pump, the volume of oil on the non-process side of the diaphragm must remain constant.
Conventional metering pumps rely on vacuum sensing or mechanical activation to compensate for leakage past the plunger and may not compensate on every pump stroke.Hydra-Cell pumps incorporate a replenishment valve in every piston assembly which operates on the suction stroke, thus ensuring optimum actuating oil volume on every diaphragm pressure stroke to provide superior accuracy.
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WANNER says its new Hydra-Cell Metering Solutions model MT8 triplex metering pump is designed to handle a variety of processing liquids with very high accuracy at very low flow rates; delivering a smooth virtually pulse-less flow for a very homogeneous injection of liquids at process pressures from 0 to 245 bar.
Hydra-Cell pumps are claimed to offer the most economical solution for precision metering and dosing thanks to their simple, clever design with multiple hydraulically balanced diaphragms in a single pump head.
WANNER INTERNATIONAL says its exclusive new "Control Freak" electronic controller provides motor speed control for Hydra-Cell Metering Solutions pumps (or Hydra-Cell bare shaft pumps in metering applications) and is able to control multiple pumps with Variable Frequency Drives (VFDs) from a single point and because motor speed is directly proportionate to flow rate in a Hydra-Cell pump, high accuracy can be achieved through the use of VFDs.
