A sealless centrifugal pump where both the impeller and the motor rotor are surrounded by the pumped liquid and where a liner (can) is placed between rotor and stator to isolate the stator from the pumped liquid.

A dynamic pump that contains impellers provided with vanes to generate centrifugal force to achieve the required pressure head.

A physical object that adds or removes mechanical energy to a fluid, either constantly or periodically.

a positive displacement pump which contains a displacing element intended to be moved in a reciprocating movement to exert pressure on a fluid, typically moving within a cylindrical space.

a positive displacement pump that consists of a chamber containing gears, cams, screws, vanes, plungers or similar elements actuated by relative rotation of the drive shaft or casing and which has no separate inlet and outlet valves.

A pump that utilizes a liquid annulus held by centrifugal force around the inside of a casing by a single rotor-impeller to compress vapour isothermically.