TP50-240/2 Shaft Seals Manual

5
Type designation
Shaft seals
Grundfos type designation
Mechanical shaft seals are classified according to a
Grundfos type designation based on the design of the
shaft seal.
Most important materials
The following table shows the codes of the most impor-
tant materials, selected on the basis of the Grundfos
range of products and their fields of application.
Variant code
The variant code of mechanical shaft seals is stamped
on the pump nameplate. It is in the last position of the
type designation and consists of four letters.
Position 1 codes
Position 1 of the mechanical shaft seal variant code
shows the Grundfos type designation.
The following codes can be shown in position 1:
Positions 2 and 3 codes
Positions 2 and 3 of the mechanical shaft seal variant
code show materials of rotating face and stationary
seat.
The following codes can be shown in positions 2 and 3:
Pos. Code Material
(1) and
(2)
A
Synthetic carbon
Carbon, metal-impregnated
B Carbon, resin-impregnated
H (B/U)
Carbon with embedded
tungsten carbide (hybrid)
C Other carbons
D
Metals
Steel
N Bronze
S Cast chromium steel
U
Carbides
Tungsten carbide, chromium-
nickel-molybdenum-bonded
Q
Q
1
S
: Dense, sintered, fine-
grained silicon carbide (SiC)
Q
1
P
: Porous, sintered, fine-
grained silicon carbide (SiC)
Q
1
G
: Self-lubricating, sintered
silicon carbide (SiC)
V Metal oxides Ceramic (aluminium oxide)
(3)
E EPDM
FFXM
VFKM
KFFKM
M PTFE-sheathed O-ring
P NBR (nitrile rubber)
S Q (silicone rubber)
TPTFE
X Other elastomers
(4)
and
(5)
E Chromium (Cr) steel (EN 1.4057)
F Chromium-nickel (CrNi) steel ( EN 1.4301)
G
Chromium-nickel-molybdenum (CrNiMo) steel
(EN 1.4401)
M High-nickel alloy (Hastelloy)
T Other alloys
Example (1)A (2)U (3)U (4)E
Grundfos type designation
Material of rotating face
Material of stationary seat
Material of secondary seal
Code Description
A O-ring seal with fixed seal driver
B Bellows seal, rubber
C O-ring seal with spring as seal driver
D O-ring seal, balanced
E O-ring seal, type A, cartridge
F Bellows seal, type B, cartridge
G Bellows seal, type B, with reduced seal faces
H O-ring seal, type D, cartridge
K Bellows seal, metal, type M, cartridge
M Bellows seal, metal
O Double seal, back-to-back
P Double seal, tandem
Q Seal with flush, quench seal
R O-ring seal, type A, with reduced seal faces
S Stuffing box
T Floating gap seal
X Miscellaneous
Code Material
A
Synthetic carbon
Carbon, metal-impregnated
B Carbon, resin-impregnated
H
(B/U)
Carbon with embedded tungsten
carbide (hybrid)
C Other carbons
D
Metals
Steel
NBronze
S Cast chromium steel
U
Carbides
Tungsten carbide, chromium-nickel-
molybdenum-bonded
Q
Q
1
S
: Dense, sintered, fine-grained
silicon carbide (SiC)
Q
1
P
: Porous, sintered, fine-grained
silicon carbide (SiC)
Q
1
G
: Self-lubricating, sintered silicon
carbide SiC)
V Metal oxides Ceramic (aluminium oxide)