MSL - MMS -- Sealless
vs.Sealed ? |
 |
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.
1 - Coupling assembly
2 - Bearing assembly
3 - Lip seal
4 - Leakage opening
5 - Drive shaft
6 - Guide hose |
7 - Inner tube
8 - Outer tube
9 - Bearing star MS
10 - Bearing star SL
11 - Carbon bearing
12 - Mechanical seal |
13 - Axial-flow rotor
14 - Radial-flow impeller
15 - Pump foot
16 - Pump foot
17 - Leakage insertion
18 - Shaft seals |
|
 |
 |
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
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