TP50-160/2 Shaft Seals Manual
Table Of Contents
38
Types of shaft seals
Shaft seals
Grundfos type R
Grundfos type K seal is defined as an O-ring seal, type
A, with fixed seal driver and reduced seal face.
Description/features
• Especially suitable for anti-freeze liquids or liquids
containing large quantities of solid or precipitated
particles.
• Strong seal drivers ensure torque transmission even
under extreme operating conditions.
• Lapped seal faces with a flat, rough surface prevent
seizure, possibly causing a slight leakage during the
running-in wear period (10 - 30 days).
• Risk of fretting (wear corrosion) in corrosive liquids.
Fretting occurs when an O-ring wears the protective
oxide film of a stainless steel shaft.
• As standard available for ø12, ø16 and ø22 mm
shaft in tungsten carbide/tungsten carbide with
EPDM or FKM O-rings.
Fig. 54
Type R seal
Application profile
The type R seal has a tungsten carbide/tungsten car-
bide application profile.
Type R with tungsten carbide/tungsten carbide 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. At temperatures below freezing point, the dia-
gram is based on a mixture of water and glycol.
The figures in the following table refer to the pressure-
temperature diagram.
Fig. 55
Pressure-temperature diagrams
TM01 5046 1499
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. Range
1 Optimum duty range
2
Risk of periodical noise in connection with start-up and
variations in pressure and temperature
TM01 7406 4599