TP40-80/2 Shaft Seals Manual

25
Types of shaft seals
Shaft seals
Grundfos type B
Grundfos type B seal is defined as a bellows seal with
rubber bellows.
Description/features
• Suitable for lime- and sludge-containing liquids
where there is a risk of deposits and seizure.
• Resists fretting (wear corrosion) which occurs when
an O-ring wears the protective oxide film of a stain-
less steel shaft.
As standard available in tungsten carbide/carbon, SiC/
SiC and SiC/carbon with EPDM or FKM bellows.
Fig. 32
Type B seal
Application profiles
The type B seal has the following application profiles:
• tungsten carbide/carbon
• SiC/SiC
• SiC/carbon.
Type B with tungsten carbide/carbon seal faces
There is no relation between the indication of suitability
and the pressure-temperature diagram, but together
they form the application profile.
Suitability
Pressure-temperature diagram
The pressure-temperature diagram is based on clean
water.
The figures in the following table refer to the pressure-
temperature diagram.
Fig. 33
Pressure-temperature diagrams
TM00 2582 3097
Suitable
Suitable under
certain
conditions
Not
suitable
Alkaline liquids
Acid liquids
Dry running
Solid particles in liquid
Precipitating/lime-
containing liquids
Anti-freeze liquids
Pos.
Recommended service intervals
[operating hours] before wear-out
1 14,000 - 20,000
2 8,000 - 15,000
3 4,000 - 8,000
TM02 4275 0402