Metering pumps, often referred to as dosing pumps, are a specialized class of positive displacement pumps designed to deliver precise and accurate volumes of fluid within a specified time period. Their primary function is to inject chemicals or other substances into a process stream at an exact and controlled rate, ensuring that the desired concentration or reaction is consistently achieved. Unlike general-purpose pumps that move large volumes of fluid, metering pumps are engineered for precision, making them indispensable in a vast array of industries where accurate chemical addition is critical for product quality, process control, safety, and environmental compliance. From the micro-dosing of potent active pharmaceutical ingredients to the continuous injection of corrosion inhibitors in pipelines, the reliability and exactitude of metering pumps underpin countless industrial operations. The evolution of these pumps has been driven by the increasing demand for automation, stringent regulatory requirements, and the need for greater efficiency and waste reduction in chemical usage. They represent a fundamental tool in modern process engineering, enabling complex chemical reactions, maintaining water quality, and ensuring the integrity of manufactured goods.