Grundfos NB Serie Instrucciones De Instalación Y Funcionamiento página 10

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