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V-Belt Drive Screw Compressors

Versatile V-belt drive

Kaeser screw compressors with V-belt drive are economical, efficient, and reliable. The automatic tensioning device ensures excellent transmission efficiency over the life of the unit and reduces maintenance costs. Screw compressors with V-belt drive are especially flexible if an increase in working pressure becomes necessary.


SX to AS Series
Horsepower: 3 to 30 hp
Capacities: 8.8 to 124 cfm
Standard pressures: 80 to 217 psig


filter feature

Cooler and Filter Mats

Conveniently located on the outside of the unit, standard high-efficiency coolers provide maximum cooling resulting in low approach temperatures for more moisture separation at the compressor discharge and better air quality.

A filter mat simplifies cooler maintenance. Dirt and dust build up on the outside of the filter, where it is easily seen and removed. This extends cooler service intervals and increases thermal reserve for harsher conditions.



The energy-saving Sigma Profile airend

Kaeser’s power-saving, proprietary airend design delivers pressures up to 217 psig. Our newly designed airends are precision-machined to close tolerances and optimized in size and profile to match the low airend speeds with their best specific performance. Manufactured according to strict quality standards and supported by precision-aligned roller bearings, these airends guarantee long operational life and outstanding reliability.



TEFC motor with reduced voltage starter
High-efficiency, totally enclosed, fan-cooled (TEFC) motors with Class F insulation are standard for long life in harsh environments. Tri-voltage 208-230/460V or 575V, 3-phase, 60 Hz is standard. Other voltages are available. Magnetic Wye-Delta reduced voltage starters ensure low starting current and smooth acceleration.



Efficient separation system

A three-stage separator (ASME or CRN) combines centrifugal action and a two-stage coalescing filter to reduce fluid carry-over to 2 ppm or less. Quick-release fittings, drain and fill ports are arranged for fast and easy fluid changes from sump and cooler without any pumping device. The easy-to-read fluid level indicator can be checked without opening or stopping the compressor through a window in the service panel.


sigma basic

Sigma Control Basic

Kaeser’s new Sigma Control Basic is a simplified, PLC-based controller. Designed to monitor primary compressor functions and display basic operational data, Sigma Control Basic is an exceptionally cost effective choice for small to medium sized facilities with a single compressor.

Sigma Control Basic is standard on Kaeser’s SX, SM, SK and AS series rotary screw compressors. It is the perfect solution for single unit installations with straightforward control requirements. Sigma Control is available as an option on these units and is recommended for multiple unit installations.

Features and functions:

  • Easy to understand icons and large display area
  • Fully automatic Dual control (full load/ idle/ on/off control)
  • Monitors air system pressure parameters, airend temperature and rotor rotation
  • Counter for service, load and operation hours
  • Adjustable service intervals, pressure and temperature unit selection (bar/ psi/ MPa, °C/°F)
  • Adjustable nominal system pressure and adjustable switching differential
  • Group alarm volts-free contact
  • Electronic pressure transducer



Debating between a piston unit and a screw compressor?

Kaeser’s rotary screw compressors offer many benefits when compared to a piston compressor:

  • The duty cycle of our rotary screw compressors allows the compressor to run up to 100% of the time. There is no need to over-size your compressor to allow for cool down.
  • Operating temperatures are at least 100°F cooler than piston units, resulting in longer life.
  • There are no pistons or rings to wear out.
  • More consistent pressure means you do not waste energy running 30 to 50 psig above your required pressure.
  • Aftercooler removes 80% of the moisture.
  • Lower oil carry-over (90% less than piston units) contributes to better air quality, even without the built-in dryer option.
  • Rotary screw units have better product quality and much less scrap.
  • Kaeser screw compressors have less equipment maintenance and far longer tool life than with piston units.
  • Kaeser screw compressors offer more air per horsepower, reducing your energy costs.
  • Kaeser screw compressors are quieter than piston units, allowing a quieter work environment and more flexibility in installation.
ModelRated Motor PowerCapacity at 125 psig
SX 3 / SX 4 / SX 5 / SX 7.5 3 hp to 7.5 hp12 cfm to 28 cfm
SM 7.5 / SM 10 / SM 157.5 hp to 15 hp32 cfm to 53 cfm
SK 15 / SK 2015 hp to 20 hp71 cfm to 88 cfm
AS 20 / AS 25 / AS 3020 hp to 30 hp92 cfm to 124 cfm

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