Grundfos NBG Series - Shaft Seal Specifications; Shaft Seal Diameter and Pressure Ratings

English (GB)
9
6.8 Shaft seals
The operating range of the seals is described
for two main applications: pumping of water or
pumping of coolants.
Seals with a temperature range of 0 °C and up
are mainly used for pumping water, while seals
for temperatures below 0 °C are mainly
intended for coolants.
Note: Operation at maximum temperature and
maximum pressure at the same time is not
recommended as the seal life will be reduced
and periodical noise will occur.
Shaft seal diameter [mm] 28, 38 48 55 60
Shaft seal type
Seal
faces
Rubber Code
Temperature
range
Max. pressure [bar]
Bellows seal,
type B,
unbalanced
AQ
1
EPDM BAQE 0-120 °C 16 16 16 16
AQ
1
FKM BAQV 0-90 °C 16 16 16 16
BQ
1
EPDM BBQE 0-120 °C 16 16 16 16
BQ
1
FKM BBQV 0-90 °C 16 16 16 16
Q
1
B EPDM BQBE 0-100 °C 16 - - -
Q
7
Q
7
EPDM BQQE -25 - +120 °C 16 16 16 16
Q
7
Q
7
FKM BQQV -10 - +90 °C 16 16 16 16
Bellow seal,
type B,
unbalanced
with reduced
seal faces
Q
1
Q
1
EPDM GQQE -25 - +60 °C 16 16 16 16
Q
1
Q
1
FKM GQQV -10 - +60 °C 16 16 16 16
O-ring seal,
type A,
unbalanced
Q
1
A EPDM AQAE 0-120 °C 16 16 16 16
Q
1
A FKM AQAV 0-90 °C 16 16 16 16
Q
1
Q
1
EPDM AQQE -25 - +90 °C 16 16 16 16
Q
1
Q
1
FKM AQQV -10 - +90 °C 16 16 16 16
Q
1
Q
1
HNBR AQQX -15 - +90 °C 16 16 16 16
Q
1
Q
1
FFKM AQQK 0-90 °C 16 16 16 16
O-ring seal,
type D,
balanced
AQ
1
FXM DAQF 0-140 °C 25 25 25 25
Q
6
Q
6
EPDM DQQE -20 - +120 °C 25 25 25 25
Q
6
Q
6
FKM DQQV -10 - +90 °C 25 25 25 25
Q
6
Q
6
HNBR DQQX -15 - +120 °C 25 25 25 25
Q
6
Q
6
FFKM DQQK 0-120 °C 25 25 25 25