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The ROTORCOMP NK31-V018 is a Germany-engineered, oil-injected screw air end (or screw compressor compact module) that features advanced EVO® technology with ROLLING PROFILE®. It is designed as a compact, integrated unit that combines the essential components of a compressor system into a single module, providing reliable and efficient compressed air generation.
The NK31-V018 is part of ROTORCOMP's EVO®-NK series of air compact units. Each compact unit integrates the following components:
EVO® oil-injected air end with ROLLING PROFILE®
Intake valve with control unit and air filter
Oil reservoir and oil separation system with coalescing cartridge(s)
Oil filter and oil thermostat valve
Minimum pressure valve and non-return valve
| Model | NK-31 |
| Max Flow rate | 3~7.5kW |
| Max Flow rate | 1.2m3/min |
| Pressure Range | 5~15 Bar |
| Weight | 42kg |
EVO® Technology with ROLLING PROFILE® – High efficiency, low noise, low power consumption.
All-in-One Compact Unit – Integrates intake valve, air filter, oil separator, oil filter, thermostat, and minimum pressure valve. Saves space and reduces piping/leakage.
Durable & Robust – Cast iron housing, larger bearings, and wear‑free profile for long service life.
Easy Maintenance – All service points accessible from one side; no special tools needed.
Flexible Application – Wide pressure range (5‑15 barg), suitable for various motors and drive options (belt, direct, gear).
German Quality – 100% bench‑tested, backed by ROTORCOMP® SIZING AIR Software.
Application Industries
The ROTORCOMP NK31-V018 screw air end is designed for industrial applications and continuous operation. Its sole intended use is the compression of atmospheric air in compressed-air generating stations.
Primary Applications:
Electrical compressor stations – the NK31 is widely used in electric compressor packages
Industrial compressed air systems – for fixed and mobile compressor applications
Gas compression industry – screw air ends and compact units are particularly suited for gas compression needs
Key Industry Sectors:
Light industry
Printing companies
Coal mining enterprises
Oil refining (petrochemical) plants
Metallurgy
Electric power generation
Medical facilities
