NOTOS 4NS Geared Twin Screw Pump

4 NS – Pompa a quattro viti

La pompa a quattro viti NOTOS® ha due alberi con quattro viti rotanti all'interno della cartuccia ad ingranaggi sincronizzati. Le viti sono sincronizzate dagli ingranaggi stesssi.

Self-priming NOTOS® 4NS geared twin screw pumps convince by high flow with minimal turbulence without metal-to-metal contact of the screws.

Due to the High Efficiency Unique Design (HEUD), the 4NS twin screw pumps ensure an extremely continuous and gentle conveying of the product. State-of-the-art technology ensures precise tolerances and an optimised screw profile. This results in low life cycle costs and long service life. Geared twin screw pumps have two shafts and four screws. The torque is transmitted to the driven shaft via helical gears. This design is hydraulically balanced and prevents metal to metal contact between the single screws, which significantly reduces maintenance. The wide range of materials, from grey cast iron and chrome-nickel steel to duplex, superduplex or hastelloy steel, enables universal use in numerous industries. The application spectrum of the 4NS ranges from non-abrasive to moderately abrasive as well as from non-corrosive to corrosive pumped media. In addition, lubricating and non-lubricating fluids with low to high viscosities can be transported. As a result, and because of the small footprint they are used for pumping in shipping, power generation, tank farms and the process industry. In addition, 4NS twin screw pumps meet the standards of the American Petroleum Institute (API) through an optional extension. This means that they can also be used in the oil & gas sector and the petrochemical industry without any problems.

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NOTOS 4NS Geared Twin Screw Pump

1 Screws
Nitrated in alloy steel or in stainless steel. The HEUD (High Efficiency Unique Design) provides excellent performance.

2 Housing with optional heating jacket
The optional heating jacket enables a constant temperature of the pumped medium. There are also various connection configurations, for example top top, side top or in line, and the liner can be replaced.

3 Timing Gear  
Helical timing gears transfer the torque with reduced vibration and noise.

4 Mechanical Seal
Four mechanical seals under suction pressure.


Pressure max.


Capacity max. 


Operating rotational speed


4NS-/16-1 16 150 3.600
4NS-/16-2 16 250 3.600
4NS-/16-3 16 400 3.600
4NS-/16-4 ​​​​​​​16 550 3.600
4NS-/16-5 ​​​​​​​16 800 3.600
4NS-/16-6 ​​​​​​​16 1100 3.600
4NS-/16-7 ​​​​​​​16 1600 3.600
4NS-/16-8 ​​​​​​​16 1950 3.600
4NS-/16-9 ​​​​​​​16 2700 3.600
4NS-/40-1 40 100 3.600
4NS-/40-2 ​​​​​​​40 150 3.600
4NS-/40-3 ​​​​​​​40 250 3.600
4NS-/40-4 ​​​​​​​40 400 3.600
4NS-/40-5 ​​​​​​​40 600 3.600
4NS-/40-6 ​​​​​​​40 850 3.600
4NS-/40-7 ​​​​​​​40 1100 3.600
4NS-/40-8 ​​​​​​​40 1500 3.600
4NS-/40-9 ​​​​​​​40 1900 3.600

*Further sizes and technical data on request.

  • High Efficiency
  • No metal to metal contact
  • Small footprint
  • Long service life
  • Excellent suction capability
  • Long service life
  • Wide range of applications
  • Wide range of materials
  • Optionally according to API 676 (American Petroleum Institute) requirements

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