Technical data

Housing

Unalloyed and alloyed steel · Cast steel · optional with coating

Gearwheels

Nitrided steel · Tool steel · Special steel · optional with coating · Helical gearing · Herringbone gearing

Axial shaft seals

(Vacuum) threaded shaft seal · Stuffing box · Combination of threaded shaft seal and stuffing box · double, locked mechanical seal

Heating

Heat transfer oil · Steam

Friction bearings

Tool steel · NiAG (nickel-silver) · Al bronze · Special materials · optional with coating

Application examples for WITTE polymer discharge pumps from the POLY series

Plastics

PET · PA · PBT · PC · PS SAN · ABS · HIPS · PP · PE · POM

Polymer discharge pumps

Reliable and robust pumps are needed to empty reactors and containers particularly during the polymerization process. The pumps transport the melt throughout the process. The highly viscous material must be transported from a reactor under vacuum. Discharge pumps from the POLY series from WITTE are specifically created for this task. The customer can choose between a standard design or an individual design according to their requirements.

Operating parameters

Viscosity

Up to 40.000.000 mPas

Temperature

Up to 450°C

Suction pressure

Vacuum up to max. 40 bar

Transport pressure /differential pressure

Up to 320 bar (4642 psig). The values listed are standard values and must not coincide under certain circumstances. Others values are available upon requests.

Pump sizes

From 4.7-22-22 (4.7 ccm/rev – 10 kg/h) to 25,000-360-360 (25,000 ccm/rev – 52,000 kg/h). Sizes with wider gear pumps for lower differential pressures are available by default, for example, 3,170-152-254 (3,170 ccm/rev).