The rotor pump consists of an exquisite pump housing and a rotating rotor. It has no suction valve and no drain valve. The side of the rotor in contact with the liquid in the pump acts directly on the liquid in the form of static pressure and is squeezed by the rotating rotor Discharges the liquid while leaving room on the other side to create a low pressure that allows the liquid to be continuously inhaled. Rotor pump head pressure is higher, the flow is usually smaller, uniform discharge, suitable for conveying high viscosity, lubricity, but does not contain solid particles of liquid. Rotor pump type gear pump, screw pump, vane pump, flexible impeller pump, Roots pump, rotary piston pump. Gear pumps and screw pumps are the most common rotor pumps.