Precision Dosing Screw Pump: A Technical Overview Precision dosing screw pumps are highly specialized positive displacement pumps designed for accurate and consistent fluid delivery in applications requiring exact dosing control. These pumps are widely used in industries such as pharmaceuticals, food processing, chemical manufacturing, and water treatment, where precise metering of liquids is critical. Working Principle The screw pump operates based on the progressive cavity principle, where a helical rotor rotates within a stator, creating sealed cavities that move fluid from the inlet to the outlet. The rotation of the screw generates a smooth, pulsation-free flow, ensuring uniform dosing. The pump's precision is achieved through tight tolerances between the rotor and stator, minimizing slip and maintaining consistent flow rates even at low speeds. Key Features 1. High Accuracy – Precision screw pumps offer exceptional dosing accuracy, typically within ±1% of the set flow rate, making them ideal for applications requiring strict volumetric control. 2. Variable Flow Control – By adjusting the rotational speed (via stepper or servo motors), the flow rate can be precisely modulated without compromising accuracy. 3. Self-Priming Capability – These pumps can handle viscous and shear-sensitive fluids while maintaining self-priming performance, reducing the need for additional priming systems. 4. Low Pulsation Flow – The continuous cavity movement ensures minimal pulsation, which is crucial in sensitive processes like chromatography or additive dosing. 5. Chemical Compatibility – Constructed from materials such as stainless steel, PTFE, or engineered polymers, screw pumps can handle corrosive, abrasive, or high-purity fluids. Applications - Pharmaceuticals: Precise dispensing of active ingredients, solvents, and reagents. - Food & Beverage: Metering flavors, colorants, or additives with hygiene-compliant designs. - Water Treatment: Chemical dosing for pH adjustment or disinfection. - Chemical Processing: Handling aggressive or viscous fluids in batch processes. Advantages Over Other Pump Types Compared to diaphragm or peristaltic pumps, screw pumps provide superior accuracy for viscous fluids and longer service life with minimal maintenance. Their ability to handle varying viscosities without flow rate deviations makes them a preferred choice for precision applications. Conclusion Precision dosing screw pumps are indispensable in industries demanding exact fluid control. Their robust design, accuracy, and versatility make them a reliable solution for critical dosing tasks where consistency and repeatability are paramount.