English (GB)
20
* Antimony, not approved for potable water.
The example shown is an LS 125-100-305F/273.1 standard type
with standard coupling, DIN PN 16 flange, cast iron pump
housing with SS304 impeller, BBQE mechanical shaft seal and
clockwise direction of rotation.
7.2.1 Codes for mechanical shaft seal
Positions (1) - (4) cover four pieces of information about the
mechanical shaft seal:
The following table explains the positions (1), (2), (3) and (4).
For other mechanical shaft seal variants, please contact
Grundfos.
7.2.2 Codes for stuffing box
ABQV: O-ring seal, unbalanced, carbon/SiC, FKM
DBQE: O-ring seal, balanced, carbon/SiC, EPDM
DBQV: O-ring seal, balanced, carbon/SiC, FKM
SBQE: Rubber bellows seal, balanced, carbon/SiC, EPDM
SBQV: Rubber bellows seal, balanced, carbon/SiC, FKM
BQQE: Rubber bellows seal, unbalanced, SiC/SiC, EPDM
BQQV: Rubber bellows seal, unbalanced, SiC/SiC, FKM
AQQE: O-ring seal, unbalanced, SiC/SiC, EPDM
AQQV: O-ring seal, unbalanced, SiC/SiC, FKM
DQQE: O-ring seal, balanced, SiC/SiC, EPDM
DQQV: O-ring seal, balanced, SiC/SiC, FKM
SQQE: Rubber bellows seal, balanced, SiC/SiC, EPDM
SQQV: Rubber bellows seal, balanced, SiC/SiC, FKM
BBVP: Rubber bellows seal, carbon/aluminium oxide, nitrile rubber
SNEK: Stuffing box with synthetic polymer packing rings, uncooled, with internal barrier fluid
Direction of rotation
(Pump direction of rotation as seen from the motor end)
1: Clockwise
2: Counterclockwise
Code Example LS 125 -100 -305X /273.1 , (W) 1 F2 D S BBQE 1
Example (1) (2) (3) (4)
Grundfos type designation
Material, rotating seal face
Material, stationary seat
Material, secondary seal and other rubber and composite parts
Pos. Type Short description of seal
(1)
A O-ring seal, unbalanced
B Rubber bellows seal, unbalanced
D O-ring seal, balanced
S Rubber bellows seal, balanced
H Cartridge seal, balanced
Pos. Type Material
(2) and (3)
A
Carbon, metal-impregnated (antimony, not
approved for potable water)
B
Carbon, resin-impregnated (approved for
potable water)
Q Silicon carbide
U Tungsten carbide
V Aluminium oxide
Pos. Type Material
(4)
EEPDM
P Nitrile rubber (NBR)
VFKM (Viton
®
)
Pos. Code Short description of stuffing box
1 S Stuffing box with packing rings
2
Cooling method
N Uncooled stuffing box
3
Barrier fluid
E With internal barrier fluid
4K
Synthetic polymer packing rings, graphite
impregnated. NBR O-ring in the pump
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