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Series XSB 900

Sulzer flow booster XSB 900

The compact Sulzer flow boosters have been designed for a wide range of applications. The units are suitable to achieve flow pattern in large tanks and open waters for mixing and stirring applications.


The Sulzer flow booster XSB is designed as a compact, water pressure-tight unit including propeller and integrally lockable coupling system. The flow boosters are available in the material version: Cast iron (EC).


Premium Efficiency IE3, squirrel cage, 3-phase, 4-pole, 50 Hz, insulation class F (155 °C), max. submergence 20 m.


Technically optimized, axially operating 3-blade propellers with very good self-cleaning effect for vibration-free operation. The propellers are designed to achieve high thrusts and therefore a high flow capacity in axial direction.

Solids deflection ring

The patented solids deflection ring protects the mechanical seal from damage by ingress of solids or fibrous matter.


All bearings are lubricated-for-life and maintenance-free, with a calculated life time of more than 100,000 h.


Robust fatigue strength gearbox of high efficiency and very long operating life, oil lubricated.

Shaft sealing

Motor side dual radial seal, medium side silicon carbide mechanical seal independent of direction of rotation. O-Rings / lip seals: NBR.

Seal monitoring

DI-system with a sensor in the junction box, oil chamber, motor, and gearbox.

Temperature monitoring

TCS-Thermo-Control-System with bimetallic contacts as thermal sensors in every phase of the stator give a timely warning or switch off the motor automatically before the permissible temperature limit e.g. due to overloading, high temperatured medium, or other problem sources, has been exceeded.


10 m sewage-resistant S1BN8-F.


Explosion-proof version, seals in viton, cable protection sleeve, PTC or PT 100 in the stator. Weight XSB 900: 251 kg.Concrete pedestal and coupling device: 225 kg.


Flow booster performance

Hydraulic №


dia. in mm

Mixer power

PP in kW

Motor kW
XSB 931 900 0,6 1,2
XSB 932 900 1,2 1,8
XSB 933 900 1,9 2,5
XSB 934 900 2,4 2,5

Motor data

Motor РА 12/4 РА 18/4 РА 25/4
Rated power (kW) 1.2 1.8 2.5
Rated current at 400 V (A) 3.75 3.59 4.63
Motor efficiency (%) 87.8 88.3 89.6
Speed (min-1) 86 108 121-134


Part Material
Motor housing EN1563; EN-GJS-400-18 (GGG-40)
Motor shaft 1.0060 (St 60-2)
Propeller shaft 1.7225 fully encapsulated (42CrMo4)
Propeller 1.4571 (AISI 316)
Coupling bracket DIN 17 445; 1.4408 (CF-8M)
Fasteners 1.4401 (AISI 316)