TP80-240/2 Shaft Seals Manual

36
Types of shaft seals
Shaft seals
Grundfos type K
Grundfos type K seal is defined as a metal bellows seal
(type M, cartridge type).
Description/features
• Especially suitable for liquids containing large quan-
tities of precipitated particles.
• The seal is suitable for temperatures above +100°C.
• Can be replaced without dismantling the pump part.
In addition, the shaft seal of pumps with motor sizes
above 7.5 kW can be replaced without removing the
motor.
• The seal has a long life compared with other seal
types due to the balancing ratio.
• Suitable for lime- and sludge-containing liquids
where there is a risk of deposits and seizure.
Fig. 50
Type K seal
Application profiles
The type K seal has the following application profiles:
• tungsten carbide/carbon
• tungsten carbide/hybrid
• tungsten carbide/tungsten carbide.
Type K 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. 51
Pressure-temperature diagram
TM02 4279 0402
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 - 14,000
3 4,000 - 8,000
TM02 4300 0402