The canned motor pump is an integral, compact unit without shaft seal. This type of pump combines the rotating part of the pump hydraulics with the rotating part of the motor on a common shaft. The pump shaft is completely enclosed by a tightly welded rotor lining that separates the rotor assembly from the stator of the drive motor. This design principle eliminates the need for shaft seals (e.g. mechanical seals or shaft bushings) and prevents leakage. Therefore, canned motor pumps are also called ‘sealless’ or ‘hermetically sealed’.

Magnetically coupled pumps are a combination of conventional pump hydraulics with a permanent-magnetic drive system and a three-phase motor. This system uses the attraction and repulsion forces between permanent magnets in both coupling halves for contactless and slip-free torque transmission. Between the two coupling halves equipped with magnets is the can separating the product space from the surroundings. The hermetic leak tightness of the magnetically coupled pumps is ensured by a single-acting safety casing. Magnetically coupled pumps are used particularly for toxic, odour-intensive or otherwise hazardous pumped media as the can shields the medium hermetically from the surroundings.

A liquid ring vacuum pump is a rotary displacement pump in which an eccentrically mounted rotor with fixed blades pushes a liquid against the wall of the stator (housing). The liquid takes the form of a ring concentric to the stator and forms together with the rotor blades several spaces with changing volumes. The pumps can be manufactured conventionally as well as hermetically sealed with magnetic drive or canned motor drive. The leak tightness of these pumps is particularly important when it comes to pumping highly toxic, carcinogenic or radioactive gases and / or vapours where leakage of operating liquid is unacceptable. The main field of application is in the chemical industry and in process engineering for the extraction and compression of dry and above all moist process vapours.