EP-CM320GPV Water-Lubricated Oil-Free VSD Screw Air Compressor for PET Bottle Blowing

EP-CM320GPV | 320 kW CMG Series Flagship — 12.6–31.5 m³/min at 40 Bar

The EP-CM320GPV sits at the apex of Ever Power's CMG water-lubricated oil-free compressor series. With a peak free air delivery of 31.5 m³/min (1,113 cfm) at pressures up to 4.0 MPa (40 bar), it is the single highest-output configuration in the series — designed for the world's largest PET bottle blowing plants, where compressed air demand at the scale of entire production facilities must be met from a single intelligently controlled system that guarantees ISO 8573-1 Class 0 air quality across every cubic meter of output.

The 320 kW symmetric dual-motor configuration — two 160 kW permanent magnet VSD motors — provides the power foundation for this output while maintaining the full technology advantages of the CMG series. Water lubricates, seals, and cools the compression chamber continuously, keeping the process at ambient +15°C regardless of motor load. The single-screw air end achieves single-stage compression to 40 bar without intercoolers. Aviation-grade star wheel materials and the patented no-shaft-sealing design sustain this performance for a designed service life exceeding 25 years of continuous 7×24 operation.

For the largest PET blowing plants — those running 40+ cavity lines producing 90,000 or more bottles per hour, those supplying four or more simultaneous production lines from a central compressed air station, or those operating in markets where a single Class 0 certified compressor must cover an entire multi-format production facility — the EP-CM320GPV is the definitive solution within the CMG water-lubricated technology family. For multi-unit station design, AI-optimised operation planning, and full SCADA integration engineering, contact Ever Power's engineering team directly.

Technical Specifications

Symmetric 160+160 kW: Maximum Redundancy at Maximum Scale

The decision to use identical 160 kW motors at the 320 kW power class is deliberate engineering rather than convention. At this output scale, the consequences of a complete compressor shutdown are maximally severe — multiple production lines halted simultaneously, bottle inventory gaps cascading into filling line stoppages. The symmetric motor architecture provides the strongest possible fault resilience: if either motor triggers a fault condition, the other immediately sustains operation at approximately 15.75 m³/min — sufficient for many large facilities to continue production on their primary lines at reduced speed while the fault is investigated and resolved.

Maximum Production Capacity Reference

CMG Series Complete Overview: Where EP-CM320GPV Leads

Water Lubrication at 320 kW: Isothermal at Industrial Scale

At 320 kW input power, the thermodynamic advantage of water lubrication reaches its most significant expression. The compression heat generated by a 320 kW air end — if left to accumulate as in a dry adiabatic process — would demand extensive multi-stage intercooling infrastructure, adding equipment cost, maintenance complexity, and unavoidable stage-boundary energy losses to the system. The EP-CM320GPV eliminates this entirely: water injected throughout the compression cycle absorbs heat at the instant of generation, maintaining the chamber at ambient +15°C and achieving near-isothermal compression at every operating point from 12.6 to 31.5 m³/min.

This isothermal performance at 320 kW translates to the largest absolute energy saving in the CMG series. The 10%+ reduction in specific energy versus dry adiabatic compression, combined with the 35% VSD saving versus fixed-speed operation, makes the EP-CM320GPV the most energy-efficient compressed air solution available at this output level for PET bottle blowing applications. For large facilities where compressed air electricity consumption represents a significant fraction of total site energy cost, these combined savings are operationally transformative over the 25+ year service life of the machine.

Manufacturing & Pre-Shipment Verification

The EP-CM320GPV undergoes the most extensive pre-shipment testing protocol in the CMG product line. Every unit is tested at full 320 kW load across the complete 2.0–4.0 MPa working pressure range, with sustained operation at maximum FAD to verify thermal stability. Both VSD motor systems are independently commissioned and tested, acoustic measurement is performed at rated full load, and all SCADA, IoT, and 485 communication systems are verified against the facility's own infrastructure where possible. Germany TUV ISO 8573-1 Class 0 certification documentation is included with every unit. Manufacturing is conducted in Ever Power's 68,000 m² ISO 9001 and ISO 14001 certified facility, which has produced water-lubricated oil-free screw compressors continuously since 2005. For engineering consultation on station design, multi-unit configurations, and site-specific system integration, visit the Ever Power company page.

Customer Case Studies

Frequently Asked Questions