Single Volute Twin Screw pump with mechanical seal

Flow Rate

max. 1.800 m³/h

Differential Pressure

max. 40 bar

Temperature Range

-120 °C to +350 °C

Pressure Rating

max. PN 400


  • Design according to API 676, 3rd Edition
  • Wellenabdichtung über Gleitringdichtung, Wellendichtringe oder Stopfbuchspackung
  • Shaft Seal: Face Seal or Gland Packing
  • Mechanical Seals according API 610/682
  • Modular Construction (Multi-Part-Casing)
  • Adaptive Feet with Centerline Mounting


  • Single Volute Twin Screw Pump in Process or in Tank Farm Design
  • Axial Split Modular Casing
  • Pressure Limiting Valve using Klaus Union Valve Series Internals
  • Centerline Mounting
  • Bearing Bracket with Oil-Lubricated or Greased-for-Life Anti-Friction Bearings
  • Spare parts are interchangeable with centrifugal pump series
  • Mechanical Seals acc. EN 12756 or API 682 / ISO 21049 as per customer preferences


Performance Range
Flow Rate Q= max. 1.800 m³/h
Differential Pressure P= max. 40 bar
Viscosity max. 100.000 mm²/s (cSt)

Higher Flow Rates upon Request

Pressure Ratings
Standard Construction PN 25 at +120 °C
Temperature Range t= -120 °C to +350 °C
Pressure Rating P= max. PN 400

Higher Pressure Ratings upon Request


  • Acids
  • Lyes
  • Hydrocarbons
  • Bitumen / Asphalt
  • Tar
  • Fuel Oils (Light and Heavy)
  • Polymers
  • Aggressive, Explosive and Toxic Liquids
  • Liquids Containing Solids
  • High-Viscosity Liquids


Pump Casing Cast Carbon Steel; Cast Stainless Steel; Duplex Stainless Steel; Super Duplex Stainless Steel
Liner Cast Carbon Steel; Cast Stainless Steel; Duplex Stainless Steel; Super Duplex Stainless Steel; Wear Resistant Coating
Rotors Carbon Steel, nitrated; Martensitic Stainless Steel, nitrated; Stainless Steel, hardened; Duplex Stainless Steel, hardened; Wear Resistant Coating
Shaft Seals Standard Cartridge Seals depending on the actual operating conditions following ANSI B73.1 / API 610 / API 682

Upon Request, Klaus Union Screw Pumps, Series DSP-2C, can be supplied also in Hastelloy, Inconel, other High Nickel Alloys or Titanium.


The pumps are outfitted with a foot heating (H4) and/or a heat jacket in the bearing lantern (H2). Both can be realized either separately or in conjunction with a bypass line. Both heating systems are rated for operating pressure of 16 bar at 200 °C (steam) or 6 bar at 350 °C in the standard construction. They can also be used for cooling.