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4STK Pump-specific cartridge mechanical seal

Pump-specific cartridge mechanical seal 4STK

For the Amarex KRT pump type series. Double, balanced cartridge mechanical seal, stationary design. An integrated impeller ensures the best possible circulation of the cooling liquid.

Main Applications

  • Untreated sewage

Technical Data

Cartridge seal
Yes
Design
Stationary
Balancing
Balanced mechanical seal
Sealing type
Double
Maximum allowable fluid temperature
100 °C

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Čechy     241 090 213
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Benefits

  • Double cartridge seal, specially developed for dry-installed pumps of the Amarex KRT type series that are fitted with a cooling jacket with coolant circulation.
  • An impeller integrated between the seal at the impeller end and the seal at the motor end ensures the best possible circulation of the cooling liquid.
  • The special seal design facilitates installation without assembly fixtures or adjusting dimension, ensuring optimal pre-loading of the mechanical seal and low wear.

Technical Data

Maximum allowable axial movement
2 mm
Minimum allowable axial movement
-2 mm
Component type series
KSB Amarex KRT [B],
KSB Sewatec [B]
Cartridge seal
Yes
Maximum allowable dynamic pressure
16 bar
Design
Stationary
Balancing
Balanced mechanical seal
Sealing type
Double
Mtrl metallic compon.mech.seal
1.4571
Mtrl mech.seal spring
1.4571
Mtrl Secondary seal outboard
FKM,
EPDM,
P [NITRIL-KAUTSCHUK (NBR)]
Mtrl Secondary seal inboard
FKM,
EPDM,
P [NITRIL-KAUTSCHUK (NBR)]
Mtrl Mating ring outboard
Q1 [SIC, DRUCKLOS GESINTERT]
Mtrl Mating ring inboard
Q1 [SIC, DRUCKLOS GESINTERT]
Mtrl Primary ring outboard
B [CARBON, RESIN-IMPREGNATED]
Mtrl Primary ring inboard
Q1 [SIC, DRUCKLOS GESINTERT]
Direction of rotation
Clockwise rotation
Maximum allowable sliding velocity
10 m/s
Spring design
Multiple springs
Maximum allowable static pressure
20 bar
Maximum allowable fluid temperature
100 °C
Minimum allowable fluid temperature
-40 °C

Sectional Drawings

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