Example 1 shows an NB 32-125.1 pump with these
characteristics:
•
reduced performance
•
142 mm impeller
•
basic version
•
ATEX approval, certificate or test report
•
DIN flange to EN 1092-2 pipe connection
•
10 bar flange pressure rating
•
cast-iron pump housing, EN-GJL-250
•
cast-iron impeller, EN-GJL-200
•
bronze/brass wear ring
•
stainless-steel shaft, EN 1.4301
•
EPDM O-ring for pump cover
•
single shaft seal arrangement
•
BAQE shaft seal.
4.2.1 Letter codes for shaft seals
Example: 10 = BAQE
Shaft seal type
A
O-ring seal with fixed driver
B
Rubber bellows seal
D
O-ring seal, balanced
G
Bellows seal, type B, with reduced seal faces
H
Cartridge seal, balanced
Material, rotating seal face
A
Carbon, metal-impregnated with antimony which is not approved for potable water
B
Carbon, resin-impregnated
Q
Silicon carbide
Material, stationary seat
A
Carbon, metal-impregnated with antimony which is not approved for potable water
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 English-language data booklet entitled
"NB, NBG, NK, NKG, NBE, NBGE, NKE, NKGE - Custom-built pumps according to EN 733 and ISO 2858".
10
)
Example 2 shows an NBG 125-100-160 pump with
these characteristics:
•
160-142 mm conical impeller
•
basic version
•
DIN flange to EN 1092-2 pipe connection
•
16 bar flange pressure rating
•
stainless-steel pump housing, EN 1.4408
•
stainless-steel impeller, EN 1.4408
•
carbon-graphite-filled PTFE (Graflon
ring
•
stainless-steel shaft, EN 1.4401
•
FFKM O-ring for pump cover
•
single shaft seal arrangement
•
DQQK shaft seal.
®
) wear
B
A
Q
E