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4STQ Pump-specific cartridge mechanical seal

Pump-specific cartridge mechanical seal 4STQ

For the Sewatec/Sewabloc and Amarex KRT pump type series. Double, balanced cartridge seal, stationary design. Springs located outside the fluid handled in the oil reservoir.
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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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Benefits

  • Double mechanical seal in tandem arrangement, can be installed as one unit, bi-directional and balanced.
  • Stationary design, springs located outside the fluid handled in the oil reservoir The springs are insensitive to contamination and provide uniform surface pressure across the seal faces, thus ensuring a long service life.
  • Tailored to the seal installation space and requirements of the pump.

Technical Data

Maximum allowable axial movement
2 mm
Minimum allowable axial movement
-2 mm
Component type series
KSB Amarex KRT [B],
KSB Sewabloc [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
X39CRMO17-1
Mtrl mech.seal spring
X6CRNIMOTI17-12-2,
NIMO16CR16TI
Mtrl Secondary seal outboard
FLUORINATED RUBBER
Mtrl Secondary seal inboard
FLUORINATED RUBBER
Mtrl Mating ring outboard
Q1 [SIC, DRUCKLOS GESINTERT],
U2 [TUNGSTEN CARBIDE, NI-BINDER]
Mtrl Mating ring inboard
Q1 [SIC, DRUCKLOS GESINTERT]
Mtrl Primary ring outboard
Q1 [SIC, DRUCKLOS GESINTERT]
Mtrl Primary ring inboard
Q1 [SIC, DRUCKLOS GESINTERT]
Direction of rotation
Bi-directional
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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