4 Description
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4STQ
2580.821/04-EN
4 Description
4.1 General description
▪ KSB mechanical seal
Mechanical seal for installation in pump sets and other rotating machinery in
accordance with the manufacturer's instructions.
4.2 Designation
Example: C120/120M1-4STQ
Table4: Designation key
Code Description
C Design
C Cartridge seal
120/120 Nominal diameter
M Direction of rotation
M Bi-directional with multi-spring arrangement
S Bi-directional with single spring
L Direction of rotation anti-clockwise
R Direction of rotation clockwise
1 Anti-twist lock of mating ring
0 Without lock
1 With lock
4STQ Type series
4.3 Materials
▪ Depending on the application
▪ See product literature of the pump
▪ Selection of suitable material variant on request
4.4 Design details
Design
▪ Cartridge seal
▪ Double seal arrangement
▪ Suitable for non-pressurised buffer fluid in acc. with API Plan52
▪ Bi-directional
▪ Axial movability depending on the size (ðSection6.3,Page31)
▪ Multi-spring arrangement
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