Double Volute Twin Screw Pump with Shaft Seal

Flow Rate

max. 5.000 m³/h

Differential Pressure

max. 100 bar

Temperature Range

-120 °C to +350 °C


max. 100.000 mPas


  • Design according to API 676, 3rd Edition
  • Maintenance-friendly „PLUG & PUMP“ Cartridge Design
  • Dry-Run-Capable with double-acting Seals
  • Suitable for nearly every Liquids, incl. Multiphase Fluids and Polymers


  • Wide Application Range
  • Variable Rotor Designs
  • 'Plug & Pump'-Cartridge Design
  • Torque Transmission between the Drive Screw and the Idler Screw by Herringbone Gears
  • Rotors made from Single Piece Bar Stock
  • High Efficiency Execution
  • Low-Pulsation Design
  • Low-NPSHR Design
  • Clearances Designed to be contact free over the Complete Permissible Operating Range
  • Seal Options with Corresponding Flushing Plans Available


Performance Range
Flow Rate Q= max. 5.000 m³/h (22.000 GPM)
Differential Pressure P= max. 100 bar
Viscosity max. 100.000 mm²/s (cSt)
Temperature Range max. +350 °C

Higher Flow Rates upon Request


  • Viscous Liquids Containing Considerable Amount of Solids
  • Lube, Crude or Fuel Oils
  • Bitumen
  • Tar
  • Asphalt
  • Fats
  • Resins
  • Residues
  • Multiphase Products Containing Liquids, Gas and Solids


Pump casing 1.0619 / 1.4408 / 1.4470 / 1.4469
Casing cover 1.0425 / 1.4571 / 1.4462 / 1.4501
Screws 1.7227 / 1.4542 / 1.4571 / 1.4462 / 1.4501
Shaft seal Depending on the operating conditions

Upon Request, Klaus Union Twin Screw Pumps, Series DSP, can be offered in Special Construction Materials matching the Particular Application.


The pumps are outfitted with a foot heating (H4). This can be realized either separately or in conjunction with a bypass line. The heating system is rated for operating pressure of 16 bar at 200 °C (steam) or 6 bar at 350 °C in the standard construction. It can also be used for cooling.

The thermal barrier (W) reduces ball bearing temperatures in the gearing when hot liquids are being transported.