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4UM Pump-specific cartridge mechanical seal

Pump-specific cartridge mechanical seal 4UM

For KSB's submersible motors. Single balanced cartridge seal in stationary design. Easy installation and removal also under difficult operating conditions.

Main Applications

  • Slightly contaminated water
  • Seawater

Technical Data

Cartridge seal
Yes
Design
Stationary
Balancing
Balanced mechanical seal
Sealing type
Single
Maximum allowable fluid temperature
110 °C

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Benefits

  • Easy installation and removal also under difficult operating conditions
  • Suitable for all operating conditions the submersible motor is approved for
  • Stationary design; the multi-spring arrangement provides uniform surface pressure across the seal faces, thus ensuring a long service life.

Technical Data

Minimum allowable axial movement
-3 mm
Component type series
KSB UPA [A]
Cartridge seal
Yes
Maximum allowable dynamic pressure
20 bar
Design
Stationary
Balancing
Balanced mechanical seal
Sealing type
Single
Mtrl metallic compon.mech.seal
X2CRNIMOCUWN25-7-4,
X2CRNIMON22-5-3
Mtrl mech.seal spring
NIMO16CR16TI
Mtrl Secondary seal inboard
FLUORINATED RUBBER,
ETHYLENE-PROPYLENE-DIENE-RUBBER,
P [NITRIL-KAUTSCHUK (NBR)]
Mtrl Mating ring inboard
A [CARBON, METAL-IMPREGNATED],
B [CARBON, RESIN-IMPREGNATED],
Q1 [SIC, DRUCKLOS GESINTERT]
Mtrl Primary ring inboard
Q1 [SIC, DRUCKLOS GESINTERT]
Direction of rotation
Bi-directional
Maximum allowable sliding velocity
20 m/s
Spring design
Multiple springs
Maximum allowable static pressure
30 bar
Maximum allowable fluid temperature
110 °C
Minimum allowable fluid temperature
-15 °C

Sectional Drawings

Download
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