Applications; Pumped Liquids - Grundfos NK Serie Montage- Und Betriebsanleitung

4.2.1 Codes for shaft seals
The digits are only used for double shaft seal solutions.
Digits Letters Description
10 BAQE Single mechanical shaft seal
11 BAQV Single mechanical shaft seal
12 BBQE Single mechanical shaft seal
13 BBQV Single mechanical shaft seal
14 BQBE Single mechanical shaft seal
15 BQQE Single mechanical shaft seal
16 BQQV Single mechanical shaft seal
17 GQQE Single mechanical shaft seal
18 GQQV Single mechanical shaft seal
19 AQAE Single mechanical shaft seal
20 AQAV Single mechanical shaft seal
21 AQQE Single mechanical shaft seal
22 AQQV Single mechanical shaft seal
23 AQQX Single mechanical shaft seal
24 AQQK Single mechanical shaft seal
25 DAQF Single mechanical shaft seal
26 DQQE Single mechanical shaft seal
27 DQQV Single mechanical shaft seal
28 DQQX Single mechanical shaft seal
29 DQQK Single mechanical shaft seal
50 HBQV Cartridge seal
51 HQQU Cartridge seal
52 HAQK Cartridge seal
SNEA Stuffing box
SNEB Stuffing box
SNEC Stuffing box
SNED Stuffing box
SNOA Stuffing box
SNOB Stuffing box
SNOC Stuffing box
SNOD Stuffing box
SNFA Stuffing box
SNFB Stuffing box
SNFC Stuffing box
SNFD Stuffing box
4.2.2 Letter codes for shaft seals
Example: 10 is BAQE
Shaft seal type
A O-ring seal with fixed driver
B Rubber bellows seal
D O-ring seal, balanced
Bellows seal, type B, with reduced
G
seal faces
H Cartridge seal, balanced
Material, rotating seal face
Carbon, metal-impregnated with antimony
A
which is not approved for potable water
B Carbon, resin-impregnated
Q Silicon carbide
Example: 10 is BAQE
Material, stationary seat
A
B Carbon, resin-impregnated
Q Silicon carbide
Material, secondary seal and other rubber and
composite parts, except the wear ring
E EPDM
V FKM (Viton
F FXM (Fluoraz
K FFKM (Kalrez
X HNBR
U Dynamic O-rings in FFKM and static O-rings in PTFE
For a thorough description of shaft seal types and materials, see
the data booklet "NB, NBG, NK, NKG, NBE, NBGE, NKE, NKGE -
Custom-built pumps according to EN 733 and ISO 2858".
4.2.3 Letter codes for stuffing boxes
Example:
Stuffing box type
S Packing type stuffing box
Cooling method
N Uncooled stuffing box
Barrier liquid
E With internal barrier liquid
F With external barrier liquid
O Without barrier liquid
Material
A
B
C
D
For a thorough description of stuffing boxes and materials, see
the data booklet "NB, NBG, NK, NKG, NBE, NBGE, NKE, NKGE -
Custom-built pumps according to EN 733 and ISO 2858".
B A Q E

5. Applications

5.1 Pumped liquids

Clean, thin, non-explosive liquids without solid particles or fibres.
The pumped liquid must not attack the pump materials
chemically.
Carbon, metal-impregnated with antimony which
is not approved for potable water
®
)
®
)
®
)
PTFE-impregnated fibre packing rings (Buraflon
EPDM O-rings in the pump housing
Graphite-PTFE compound packing rings
®
(Thermoflon ) and EPDM O-ring in the pump housing
PTFE-impregnated fibre packing rings (Buraflon
FKM O-ring in the pump housing
Graphite-PTFE compound packing rings
®
(Thermoflon ) and FKM O-ring in the pump housing
B A Q E
S N E A
®
) and
®
) and
9