Two Screw


How they convey fluids:

The HOUTTUIN™ and WARREN® two-screw pumps are rotary‚ self-priming positive displacement pumps. In both cases‚ the basic pump design is double ended or double suction to achieve higher flow rates. The two pumps' shafts are supported between bearings. The fluid entering the suction port is split into two equal portions‚ with half being diverted to the inlet area of each opposing screw set. As the rotating screws intermesh‚ transfer chambers are formed‚ trapping and conveying the fluid axially to the discharge location‚ which is typically located at the mid span of the pump casing. The drive relationship between the two pump shafts is achieved through a set of timing gears. These mechanical components provide the drive transmission link between the longer shaft‚ which is connected to the input driver‚ and the shorter driven shaft. By means of this design arrangement a close clearance can be maintained between the four pumping rotors and the pump casing without the possibility of metal-to-metal contact during operation. To permit the handling of contaminated‚ corrosive process fluids and dry running‚ the bearings and timing gears are located outside of the process envelope and are independently lubricated.

Strengths of the technology:

  • Able to handle contaminated and/or corrosive fluids and can even run dry
  • Effectively manages large volumes of entrained gases without vapor locking
  • Extremely low NPSH / NPIP requirements‚ ideal for stripping applications
  • Tremendous product viscosity range‚ making it an extremely versatile machine
  • Designs available to the latest edition of API 676
Maximum Flow Rate Differential Pressure Viscosity Range Min to Max Max Fluid Temperature Max Solids Content Max Free Water Content Max Gas Content CIRCOR Brand & Series
5300 m3/h
23500 usgpm
16 bar
230 psi
0.5 to 100000 cSt 140°C
2% 100% 50% Houttuin 200 series
2700 m3/h
11900 usgpm
40 bar
580 psi
0.5 to 100000 cSt 400°C
2% 100% 100% Houttuin 300 series
1400 m3/h
6200 usgpm
100 bar
1450 psi
0.5 to 100000 cSt 100°C
2% 100% 50% Warren FSXA Series/ FSXB series


Download the brochure below to see our full line of Houttuin and Warren two-screw pumps including applications, specifications and successful installations.

Download PDF

Two-Screw Brochure


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CIRCOR Industrial

(877) 853-7867 (USA and Canada)
1 (704) 291-2040 (International)

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