A rotary pump is a type of positive displacement pump. It consists of a rotating rotor and a stationary pump body. It lacks suction and discharge valves, changing the working volume through the relative movement between the rotor and the pump body. The rotating rotor's squeezing action discharges the liquid, while simultaneously creating a low-pressure space on one side to allow for continuous liquid intake.
Based on their structure and operating principle, rotary pumps can be classified into gear pumps, screw pumps, rotary piston pumps (cam pumps, Roots pumps), flexible impeller pumps, vane pumps, and hose pumps. A rotary pump is a rotating positive displacement pump with positive displacement characteristics; its flow rate does not change with back pressure.
Opportunities for rotary pumps include: viscous liquids, applications requiring metering, applications requiring self-priming, applications containing gas, low-flow-rate applications, applications requiring no shearing of the medium, and high-pressure applications requiring reverse rotation.
