Kracht KP 1 Duo Tec – Gear Pump Series

Kracht KP 1 Duo Tec – Gear Pump Series, DuroTec® gear pumps KP 1 for abrasive and poor lubricating fluids. The limit of applications of transfer gear pumps has been reached when the transfer medium does not have the required lubricity for a proper function of the pump and a high working pressure is needed at the same time.

Such problematic fluids are for example silicates (sodium silicate), isocyanates and polyols with hard fillers as can be found in the PU-technology. Under air or humidity influence, crystallisation of these fluids occurs and agrivates the lack of lubricity.

The gear (gear wheel and shafts) is surrounded by SIC sleeve bearing. The gear is high-rigid protected against wear.
Depending on the medium to be transferred, working pressures up to 150 bar are possible with driving speeds of about 1500 1/min. Solid body parts with a size < 50 μm and a hardness acc. to Vickers < 2500 will be accepted in the transfer medium.

Kracht KP 1 Application:

The main field of application for the DuroTec® pumps KP 1 are mainly multi-component-systems in the PU technology. Everywhere where standards pumps do not reach a satisfying lifetime, e.g. where polyols with hard fillers have to be handled, this pump offers a reliable alternative.


Displacement Vg 5.5 / 8 / 11 / 16 / 22 cm3/r
Mounting position horizontal (quench tank above)
Direction of rotation right
Fixing type Flange connection (dimensions page 6)
Suction connection Flange
Pressure connection Flange
Working pressure – suction side pe min – 0.4 bar
pe max 4.0 bar FKM rotary shaft lip-type seal (at 1500 1/min)
5.0 bar FKM rotary shaft lip-type seal (at 1000 1/min)
10.0 bar FKM rotary shaft lip-type seal (at 500 1/min)
=  16.0 bar mechanical seal
Working pressure – pressure side pn max 150 bar (depending on transfer medium)
Speed n 1500 1/min (depending on transfer medium)
Viscosity ν 20 000 mm2/s
Fluid temperature ϑmax 150 °C
Ambient temperature ϑu min – 20°C
ϑu max 60 °C
Efficiency Vol. efficiency 85 % at 100 bar,
n = 1000 1/min with test medium HLP 46 at 20 °C
Shaft end Tapert 1 : 5 (Hexagon nut M 12 x 1.5)
Involute spline (B 17 x 14 DIN 5482)

Download Data Sheet: Duo Tec – Gear Pump KP 1 Series


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