What Are the Types of Electric Water Pumps A screw pump is an electric water pump（https://www.china-soyue.com/product/water-pump/） that creates a pressure difference by rotating a screw. It has the advantages of stable flow, small pressure pulsation, and strong self-priming ability. Screw pumps are suitable for transporting viscous or particle-containing liquids and are widely used in chemical, petroleum, pharmaceutical and other industries. A diaphragm pump is an electric water pump that creates a pressure difference through a reciprocating diaphragm. It has the advantages of no leakage, can transport corrosive liquids, and can be idle. Diaphragm pumps are suitable for transporting corrosive, toxic and volatile liquids and are commonly used in chemical, environmental protection, food and other industries.