Variable speed rotary screw compressor

Liutech L7.5–22 PMI

The Liutech L7.5 to 22 PMI range is designed to meet the needs of European workshops and light to medium industrial applications. Using permanent magnet variable speed technology, these compact compressors adjust output to demand, reduce energy consumption, and deliver stable pressure for reliable daily operation.

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Compact PM drive

Permanent‑magnet variable‑speed motors match air output precisely to demand, minimizing energy consumption and improving efficiency during partial‑load industrial operation.

Professional cooling

Optimised airflow separation, enlarged coolers and enclosed layouts maintain stable temperatures and reliable performance in multiple industrial environments.

Easy operation

Plug-and-play to use, quick access to maintenance and friendly user interface.

Permanent magnet compressors for efficient 7.5–22 kW air supply

The Liutech L7.5–22 PMI range covers 7.5 to 22 kW oil‑injected screw compressors designed for reliable industrial air supply. Permanent‑magnet variable‑speed motors and direct drive technology minimise transmission losses while delivering stable pressure and responsive airflow across changing demand profiles.

Compact cabinets allow installation close to production equipment, reducing piping losses and saving floor space. Intuitive controls support easy monitoring and communication, this makes the L7.5–22 PMI range a practical, efficient solution for workshops, manufacturing and general industrial applications requiring dependable compressed air.

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The L7.5–22 PMI range operates across standard industrial pressure levels and delivers airflow scaled to each power size from 7.5 to 22 kW. Variable‑speed control allows output to adjust smoothly to demand, maintaining stable pressure while improving efficiency during part‑load operation. Free air delivery increases progressively through the range to support growing production needs.

Compact frame dimensions and direct‑drive layouts reduce installation complexity and pressure losses. Connection sizes, cooling capacity and electrical components are matched to each model to ensure consistent performance, reliable temperature control and suitability for continuous industrial duty within the defined power range.

The L7.5–22 PMI compressors are designed for straightforward maintenance and long service intervals. Wide‑opening panels provide clear access to filters, separators and coolers, while front pre‑filter meshes help protect internal components from dust and contamination in workshop and factory environments.

Permanent‑magnet variable‑speed technology significantly reduces energy consumption by motor regulation in line with actual air demand. Compared with fixed‑speed operation, this lowers idle losses and delivers meaningful electricity savings in applications with fluctuating usage.

Compact layout, reduced pressure drop to improve system efficiency. Lower energy use, simplified installation and reduced maintenance effort combine to deliver a lower total cost of commissioning.

Technical information

Model	Pressure	Motor	Capacity		Weight (CE)	Connection	Dimension
Model	bar(e)	kW	l/s	cfm	Kg	G	LxWxH (mm)
L7.5 PMI	7	7.5	20	43	112	G1/2''	774x618x710
	8		19	40
	10		17	35
L11 PMI	7	11	32	68	174	G3/4''	950x650x917
	8		32	68
	10		25	53
L15 PMI	7	15	39	82	174	G3/4''	950x650x917
	8		39	82
	10		31	65
L22 PMI	7	22	63	134	237	G1''	1000x725x1090
	8		63	133
	10		53	112

Unit performance measured according to ISO 1217, Annex C, ed.4 2009.

L7.5-22 PMI

Download the product brochure

Download the brochure to explore the full details of this Liutech range. Inside, you'll find key product features, technical specifications, available configurations, and insights to help you select the right solution for your compressed air requirements.