Varisco S.p.A.
Z.I. Nord - Terza Strada, 9 - 35129 PADOVA – ITALY
Tel.+39.049.8294111 Email: export@variscospa.com
Fax+39.049.8076762 Web: www.variscospa.com
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3.4 AVAILABLE CONFIGURATIONS
Progressing cavity pumps can be assembled in different configurations, according to the needs:
• Feedbox and screw feeder
• Vibrating feedbox
• Barrel emptier
• Vertical
Note: customizations include specific inlet and delivery orifices, trailer-mounted base, simple base,
electric board, thermal protections etc.
4 COMPONENTS OF THE PRODUCT
4.1 ROTOR
The rotor may be made of different materials, such as carbon steel and stainless steel. It may also be
coated with hardening surface treatments such as chromium plating, ceramic treatment, gas and ion
nitriding, etc.
4.2 STATOR
The stator is built with a steel pipe internally coating with elastomeric material, chemically
compatible with the properties of the fluid to be pumped.
It may be made with different elastomers:
Class MST °C MATERIAL MAX TEMP Class Stator
T4 135 VITON 180°C T4 VITON
T5 100 EPDM 120°C T5 EPDM
T6 85 NBR 90°C T6 NBR - SBR
SBR 90°C
CSM 70°C
MST: Maximum surface temperature allowed for machines of Group II (Cenelec standard EN
50014).
Note: It is possible to manufacture PTFE stators for special applications.
4.3 COUPLINGS
4.3.1 BEARING HOUSING COUPLING
Using the bearing housing coupling the pump is linked to the motor by the male shaft, and it is
mounted on a cast iron support through rolling bearings.
This configuration allows optimal resistance to the axial thrust towards the motor in those models
working under high pressure. The choice of the motor in this case is not affected by axial thrust.
The final coupling between motor and male shaft is made by elastic joints with a protective case.
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