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A rotary screw compressor uses two intermeshed helical rotors (screws) within a precisely machined stator to compress air. Clearances between the rotors and the stator are very small and are usually sealed by injected lubricant. As the rotors turn, their helical grooves trap air and seal against the stator wall. The volume of these grooves decreases as the rotors turn and mesh together, compressing the air while moving it to discharge port.

Rotary screw compressors are built as packages which consist of the compressor unit (air end), lubrication system, cooling system, capacity control system, and discharge air cleanup system.


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  Direct Drive Rotary Screw Compressors    

Standard Direct Drive


Simplicity of design and durability of components assures a long service life for our standard direct drive rotary screw air compressors.

  • Fewer but larger bearings
  • Slower operating speeds
  • Lower noise levels
  • 15 to 200 HP Units available
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Geared Direct Drive

Cal Supply's Driect Drive Greared Rotary Screw Air Compressors are built with optimized rotor speed in mind. This allows for a greatly enhanced performance in a given motor size.

  • Increased output and efficiency
  • No belt losses
  • 30, 40 and 50 HP Units Available
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  Updraft Cooler Direct Drive                    

In our Direct Drive Updraft Cooler Rotary Screw Compressors vertical cooling air flow simplifies exhaust ducting or heat reclamation and reduces the clearance required around the machine.

  • Prevents recirculation of hot exhaust air
  • Reduces package footprint
  • 40, 50 and 60 HP Units Available
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  Small Belt Drive Rotary Screw Compressors        

Cal Supply's Small Belt Drive Rotary Screw Air Compressors deliver more CFM per horsepower (HP) than reciprocating air compressors at pressures below 125 PSI.

  • Compact design
  • Quiet enclosures available
  • Capable of 100% duty cycle
  • Easy to maintain
  • 5, 7.5, 10 and 15 HP Models Available
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  Variable Speed Rotary Screw Compressors    

Variable speed technology allows compressor output match system demand by changing compressor speed.

  • Most efficient at loads of 70% or less
  • Considerable Energy Savings
  • Eligible for rebates from many utility companies
  • 15 through 300 HP Units Available
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  Variable Displacement Rotary Screw Compressors  
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In a Single Stage Variable Displacement Rotary Screw Compressor output is matched to system demand by changing the internal volume (displacement) of the compressor.

  • Most efficient at load levels of 70% or more
  • Considerable Energy Savings
  • Eligible for rebates from many utility companies
  • 50 through 350 HP Units Available
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  Oil Free Rotary Screw & Scroll Compressors     Back to Top  

Oil Free Rotary Scroll Compressors

  Rotary Scroll Compressor      

These machines are the perfect fit for small to medium sized medical, dental, labratory, pharmaceutical and electronics applications

  • Noise levels as low as 49 dB(A)
  • Minimal Vibration
  • Air Cooled
  • Pressures as high as 140 PSIG
  • Easy installation and maintenance
  • 3 through 40 HP Packages Available
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  Two Stage Oil Free            

Two stage oil free compressors maximize efficiency in larger sizes.

  • Cooling water is required
  • Offers the cleanest possible compressed air
  • 125 through 400 HP Units Available
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  Packaged Rotary Screw Compressed Air Systems       Back to Top  

Packaged rotart screw compressor systems offer pre-piped and wired components to minimize installation costs as well as make relocation easy.

  • 5 to 30 HP Units Available
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