DORIS metering pumps are precision transfer devices that accurately deliver chemicals such as acid, chlorine, and liquid fertilizers through the pipeline at the desired flow rate, thanks to a stable pulse generated by their electromagnetic design. Their robust drive unit and simple design reduce the need for accessories and ensure a constant, vibration-free flow, guaranteeing consistent dosing even across multiple pipelines.

The pump head is made of a high-modulus, chemically resistant material, while the valve seat is made of PTFE; all critical components in contact with the fluid consist of a pure PTFE diaphragm. This combination offers broad compatibility with acids, bases, oxidants, and process chemicals, thus reducing the risk of O-ring expansion and corrosion. However, chemical compatibility must be verified before selecting the pump, and the elastomer requirements must be validated according to the process.

Thanks to its optimized flow channels and valve geometry, DORIS eliminates instantaneous vaporization and cavitation, thus maintaining a stable flow regime even in confined spaces by reducing shear forces. This ensures dosing accuracy of ±1% and high repeatability, and the target concentration is achieved even at low flow rates and with sudden load changes.

The pure PTFE diaphragm offers high accuracy and a long service life; the manufacturer provides a five-year warranty on its lifespan. The simple body design and reduced number of accessories significantly lower consumable and labor costs; routine maintenance is limited to visual inspection, cleaning of the valve and seat, and timely diaphragm replacement.

Thanks to its advanced PTFE diaphragm, the pump can run dry after the heat transfer fluid has been depleted, thus preserving the diaphragm and ensuring smoother operation during shutdowns and restarts. The optimized suction line design (short pipe, suitable strainer, appropriate NPSH) and the optimized head prevent cavitation and gas blockages, guaranteeing quiet flow and a perfectly pure fluid.