Chemical injection pumps are specialized devices that utilize reciprocating motion of a plunger or diaphragm within a cylinder to deliver chemical agents precisely and quantitatively into process streams.   1. Working Principle The power unit drives the plunger or diaphragm to perform periodic reciprocating motion within the pump cylinder. When the plunger or diaphragm retracts, negative pressure forms inside the cylinder, opening the inlet check valve; the discharge process occurs conversely. Its metering accuracy primarily depends on the stroke length and reciprocating frequency of the plunger or diaphragm. Adjusting these parameters enables precise control of the chemical injection flow rate.   2. Types • Plunger pumps are the most widely used type of chemical injection pump. Flow is precisely regulated by altering the effective stroke through reciprocating plunger motion. They are commonly used to convey high-viscosity, high-pressure chemicals or those containing particulate impurities. • Diaphragm pumps utilize a flexible diaphragm that reciprocates to draw in and discharge chemicals. The diaphragm isolates the pump's drive components from the conveyed medium, preventing chemical corrosion and contamination of drive parts while eliminating leakage risks. This design offers significant advantages when handling highly corrosive, toxic, or volatile chemicals. (Elephant Machinery will launch new diaphragm pumps in March 2026.)     3. Drive Method • Electric chemical injection pumps utilize electric motors as their power source. They offer high drive precision, enabling precise adjustment of injection flow rates by controlling the piston/diaphragm stroke and frequency through motor speed or eccentricity regulation. This makes them suitable for applications demanding high flow stability and control accuracy, such as petrochemical processing and water treatment. • Pneumatic chemical injection pumps utilize compressed gas as their power source. Their drive system is intrinsically safe, eliminating electrical power requirements. They can operate safely in hazardous environments such as flammable/explosive areas, damp conditions, or dusty settings. They are suitable for applications with high safety requirements, such as oil and gas extraction and explosion-proof zones in chemical plants.   4. Applications • Oil and gas industry • Industrial water treatment • Chemical industry • Pharmaceutical industry • Boiler systems     Chemical injection pumps are indispensable key equipment in the oil and gas industry. Through collaborative efforts with our clients, Elephant Machinery's chemical injection pumps have garnered exceptional acclaim. Moving forward in the reciprocating pump sector, we will steadfastly adhere to our guiding principles of convenient, reliable,efficient, and intelligent solutions.