MSL - MMS -- Sealless vs.Sealed ? |
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Why sealless - The sealless design will
offer long life and a tolerance of dry running for short periods of time. The seal-less type has a leakage insertion (17), which prevents the pumped
liquids from rising between the shaft and the inner tube. This insertion guides any liquid
which leaks between the shaft (5) and the carbon bearing (11) back into the container
which is being drained. This type of pump tube does not have a mechanical seal (12).
The solution passes through small spaces in this system and thus needs to be free
of solids or abrasives. In the sealed type(left photo), a mechanical seal (12), which is also supported by two shaft seals (18) behind it is fitted underneath the bearing star (9). The shaft itself ends in the pumping element (13) or (14). The outer tube (8) is terminated by the pump foot (15) or (16). This type can deal with a small amount of abrasives or liquids that would crystallize.
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The coupling (1) connects the drive shaft of the motor to the drive shaft (5) of the pump tube. In the top section of the pump tube, the shaft is mounted on ball bearings in a tended arrangement (2). The ball bearings are protected against possible acid vapors by means of a lip seal (3). In the inner tube (7), the shaft is supported by a PTFE guide hose (6); in the bottom section of the pump tube; it is mounted additionally on a pure carbon bearing (11) inside the bearing star (9) (10). |
Bulletin for aluminum pump tube - PDF File
Bulletin for polypropylene pump tube - PDF File
Bulletin for PVDF (Kynar) pump tube - PDF File
Bulletin for stainless steel pump tube - PDF File