Rotary Screw Air Compressors
L Series 7 - 11 kW
Fixed & Regulated Speed
Well known in the industry for quality and reliability, CompAir continuously develops and expands the L-Series to achieve optimum performance and efficiency and maximum flexibility. The wide range of screw compressors from 7 to 11 kW includes fixed and regulated speed models, high efficiency models and is available as airstation including receiver and refrigerant dryer.
Engineering Excellence
Compressors are more than just a financial investment, they are a key component in ensuring that manufacturers, processors and operators receive consistent, high quality low cost air. The screw compression element is the heart of the compressor and therefore CompAir keeps the design and manufacture in-house, using the latest CNC rotor grinding machinery, coupled with online laser technology. The resulting reliability and performance ensure that operating costs will remain low throughout the compressor’s life.
Benefits
Compressor base mounted
Complete package including compressor, dryer and receiver
Small carbon foot print (by mounting the components on the receiver the footprint is reduced up to 55%)
In-house AirEnd
Highly efficient motors
Easy maintenance
Wide regulation range
It looks like you’re referring to L Series 7–11 kW rotary screw air compressors (fixed & regulated speed)—a common industrial range used in workshops, fabrication, and small manufacturing setups. Here’s a clear breakdown so you can understand (or choose) the right type.
🔧 What this range typically includes
Power range: 7.5 kW to 11 kW (≈ 10–15 HP)
Airflow: ~0.8 to 1.8 m³/min depending on pressure
Pressure range: 7 to 13 bar
Type: Oil-injected rotary screw compressors
Designed for continuous duty industrial use
These are widely used because they provide stable, continuous compressed air, unlike piston compressors.
⚙️ Fixed Speed vs Regulated (Variable) Speed
🔹 Fixed Speed (FS)
Best if your air demand is constant
Advantages:
Lower initial cost
Simple and reliable
Easy maintenance
Limitation:
Runs at full speed even when demand is low → higher energy waste
👉 Ideal for:
CNC machines running continuously
Assembly lines with steady air consumption
🔹 Regulated / Variable Speed (RS / VSD)
Best if your air demand fluctuates
Advantages:
Adjusts motor speed based on demand
Saves up to ~30–35% energy
More stable pressure (less fluctuation)
Limitation:
Higher upfront cost
👉 Ideal for:
Workshops with varying load
Multiple machines switching on/off
Energy-sensitive operations
🧠 How to choose the right one
Choose 7.5 kW → small workshop, 1–2 machines
Choose 11 kW → multiple machines or higher demand
Choose Fixed Speed → constant usage
Choose Variable Speed (RS/VSD) → fluctuating demand + want energy savings
🧾 Key takeaway
The L Series 7–11 kW compressors are a compact, reliable industrial solution
Your main decision is not just power—but Fixed vs Variable speed, which directly impacts electricity cost over time
