Grundfos NK Serie Montage- Und Betriebsanleitung Seite 8

Example 1, pump design according to EN 733
Example 2, pump design according to ISO 2858
P 1.4408 1.4517
R 1.4517 1.4517
S EN-GJL-250 1.4408
T EN-GJL-250 1.4517
U 1.4408 1.4517
W 1.4408 1.4517
X Special version
Rubber parts in pump
The first letter indicates material of O-rings for pump cover and seal cover. O-ring for seal cover is only for double seal
arrangements
The second letter indicates material of O-ring for seal housing. O-ring for seal housing is only for double seal arrangements
E EPDM
®
F FXM (Fluoraz )
®
K FFKM (Kalrez )
M FEPS (PTFE-sheathed silicone O-ring)
®
V FKM (Viton )
X HNBR
Shaft seal arrangement
B Stuffing box
C Cartridge seal, single
D Cartridge seal, double
O Back-to-back, double seal
P Tandem, double seal
S Single seal
Shaft seal(s) in pump
Letter or digit code for mechanical shaft seal and shaft seal rubber parts
4 letters: Single mechanical shaft seal, such as BQQE, or single cartridge seal, such as HBQV
Double seal solution; example 2716, where 27 is DQQV, primary seal, and 16 is BQQV, secondary seal;
4 digits:
double cartridge seal; example 5150, where 51 is HQQU, primary seal, and 50 is HBQV, secondary seal
The relation between letters and digits of the shaft seals is described on page 9.
Example 1 shows an NK 32-125.1 pump with these
characteristics:
• reduced performance
• 142 mm impeller
• grease-lubricated standard bearing design
• standard coupling
• DIN flange to EN 1092-2 pipework 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 1.4021/1.4034
• EPDM O-ring for pump cover
• single shaft seal arrangement
• BAQE shaft seal
8
Carbon-graphite-filled
1.4401
®
PTFE (Graflon )
Carbon-graphite-filled
1.4462
®
PTFE (Graflon )
Bronze/brass 1.4401
Bronze/brass 1.4462
1.4517 1.4462
Carbon-graphite-filled
1.4462
®
PTFE (Graflon )
NK 32 -125 .1
NKG 200 -150 -200
Example 2 shows an NKG 200-150-200 pump with these
characteristics:
• 210-170 mm conical impeller
• grease-lubricated heavy-duty bearing design
• spacer coupling
• DIN flange to EN 1092-2 pipework connection
• 25 bar flange pressure rating
• stainless steel pump housing, EN 1.4408
• stainless steel impeller, EN 1.4408
• carbon-graphite-filled PTFE (Graflon
• stainless steel shaft, EN 1.4401
• FFKM O-rings for pump cover and seal cover
• EPDM O-ring for seal housing
• back-to-back double shaft seal arrangement
• primary shaft seal: DQQK
• secondary shaft seal: DQQE
/142 A1 F 1 A E S BAQE
/210-170 H2 F 3 N KE O 2926
®
) wear ring