Magnetic drive :

Thanks to the use of new types of permanent magnetic materials with high energy density, it is possible to house a powerful magnetic coupling within the pump bearing support specifi ed in the standard. The magnetic drive is equipped for direct activation when  operated using standard three phase current motors and does not require any type of coupling. In addition, the permanent magnets are highly stable against demagnetising effects, such as those which may occur when assembling or disassembling the rotor or if the maximum transmittable torque is exceeded. 

Bearing arrangement :

The bearing in hermetically designed pumps must be located and immersed in the operating liquid. Therefore, in most cases, only the use of hydrodynamic slide bearings is required. The correct operating method ensures the advantage that no contact may be created between the bearing lining. Thus,  they are constantly running free from wear and maintenance. 

As a standardised bearing combination the material based on silicone carbide - silicone carbide has proved to be the best choice. 

This combination consists of a bearing sleeve made of silicone carbide (S-SiC) and a fi rm bearing bush made of the material S-SiC/1.4571. S-SiC is a pressureless sintered silicone carbide which is characterised by its high resistance against high temperatures and corrosion.Conditions of mixed friction, as they may arise for example during start-up and stopping phase of pumps, can be easily handled with this bearing combination.