Oil-Free Process Air Compressors

Oil-Free Process Air Compressors

Reciprocating, non-lubricated air compressors covering 1–500 Nm³/min and 0.1–25 MPa — the benchmark choice for PET bottle blowing, fermentation, composite manufacturing, CAES, and high-pressure valve testing. ISO 8573-1 Class 1 clean air. API 618 compliant.

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Oil-Free Process Air Compressors

Zero oil carryover. Full pressure spectrum. API 618 piston technology from 1 to 500 Nm³/min.

Flow: 1–500 Nm³/minPressure: 0.1–25 MPaPower: 5.5–10,000 KWAPI 618

Product Overview

With more than 70 years of continuous manufacturing history — the predecessor plant was established in 1951 under direct jurisdiction of China's Ministry of Mechanical Industry — Ever Power has assembled one of the most complete oil-free lubrication reciprocating air compressor lineups available from a single source. The baseline models 3L-11/7, 4L-22/7, and L5.5-42/7 earned national "Silver Quality Awards" and remain state-designated standard products, reflecting decades of measured field performance. As one of the earliest Chinese manufacturers to develop and commercialise oil-free lubrication air compressor series, the product range now spans the full pressure spectrum from low-pressure bulk conveying through to high-pressure valve integrity testing, with single-unit capacities up to 500 Nm³/min and motor drives up to 10,000 KW. All units comply with API 618 and applicable national standards, backed by ISO 9001 certification and full Class-I / Class-II pressure vessel design and manufacturing permits.

Key Technical Parameters

1 – 500

Flow Capacity (Nm³/min)

0.1 – 25.0

Discharge Pressure (MPa)

5.5 – 10,000

Motor Power (KW)

1.5 – 150 T

Piston Force

Air (oil-free)

Compression Medium

M / D / P / L / Z

Frame Types

Product Range by Pressure Class

Low Pressure / High Flow

0.1 – 0.6 MPa

High-volume duties: fermentation aeration, glass bottle blowing, dense-phase and dilute-phase pneumatic conveying of cement, fly ash, flour, and plastic pellets. PTFE-composite rings deliver zero-oil output continuously.

General Process / Instrument Air

0.6 – 1.0 MPa

Standard plant air for pneumatic actuators, control systems, and general production utilities. Eliminates downstream coalescent filtration and oil-contamination risk.

Medium Pressure — PET & Composites

2.0 – 6.0 MPa

PET stretch blow moulding, composite-material autoclave systems, and CAES grid storage. Meets ISO 8573-1 Class 1 purity; protects preform integrity in food-contact applications.

High Pressure — Testing & Environment

8.0 – 25.0 MPa

High-pressure valve and pipeline integrity testing, VOC adsorption-regeneration units, ozone generation, and wastewater aeration where oil in the test medium would mask seal failures.

Oil-Free Process Air Compressors — Product Range by Pressure Class

General-Purpose Oil-Free Air Compressor Specifications (0.55 – 5.00 MPa)

Compression medium: Air · Voltage: 380 V or 6 kV / 10 kV · Custom drives 11–2,000 KW
No. Model Pattern Flow (m³/min) Discharge Pressure (MPa) Power (KW) Weight (t)
1 DW-117/5-A 2-col 2-stage 117 0.55 550 13
2 LW-48/5.6-A 2-col 2-stage 48 0.56 280 5.5
3 DW-86/5.6-A 2-col 2-stage 86 0.56 500 13
4 DW-130/5.6-A 2-col 2-stage 130 0.56 680 13
5 LW-43.5/5.7-A 2-col 2-stage 43.5 0.57 240 (250) 5
6 LW-55/5.8-A 2-col 2-stage 55 0.58 315 6.5
7 LW-40/6-A 2-col 2-stage 40 0.60 220 4.12
8 LW-54/6-A 2-col 2-stage 54 0.60 315 6.5
9 LW-60/6-A 2-col 2-stage 60 0.60 315 6.5
10 DW-100/6-A 2-col 2-stage 100 0.60 550 13
11 ZW-3/7-A 2-col 2-stage 3 0.70 22 0.58
12 LW-11/7-A 2-col 2-stage 11 0.70 65 1.8
13 LW-22/7-A 2-col 2-stage 22 0.70 132 3
14 LW-32/7-A 2-col 2-stage 32 0.70 200 4.12
15 LW-42/7-A 2-col 2-stage 42 0.70 240 (250) 5
16 DW-60/7-A 2-col 2-stage 60 0.70 350 6
17 DW-120/7-A 2-col 2-stage 120 0.70 650 13.5
18 ZW-1.5/8-A 2-col 2-stage 1.5 0.80 15 0.58
19 LW-48/8-A 2-col 2-stage 48 0.80 280 6.5
20 DW-75/8-A 2-col 2-stage 75 0.80 450 13
21 DW-80/8-A 2-col 2-stage 80 0.80 500 13
22 DW-100/8-A 2-col 2-stage 100 0.80 609 13
23 DW-130/8-A 2-col 2-stage 130 0.80 800 18
24 DW-150/8-A 2-col 2-stage 150 0.80 900 19
25 HW-200/8-A 4-col 2-stage 200 0.80 1,200 26
26 HW-260/8-A 4-col 2-stage 260 0.80 1,600 35
27 HW-300/8-A 4-col 2-stage 300 0.80 1,800 40
28 LW-10/10-A 2-col 2-stage 10 1.00 75 1.8
29 LW-22/10-A 2-col 2-stage 22 1.00 160 3
30 LW-42/10-A 2-col 2-stage 42 1.00 315 6
31 LW-9.6/12-A 2-col 2-stage 9.6 1.20 75 1.8
32 LW-25.7/12-A 2-col 2-stage 25.7 1.20 200 3.85
33 LW-45.5/13-A 2-col 2-stage 45.5 1.30 400 7.5
34 LW-9/16-A 2-col 2-stage 9 1.60 75 1.8
35 LW-16/50-A 2-col 2-stage 16 5.00 220 6.6

Large-Capacity & Special-Application Models

Model Application Focus Flow (Nm³/min) Discharge Pressure (MPa)
LW-80/2.2 General plant air — large volume 80 0.22
DW-300/1.5 High-flow low-pressure pneumatic conveying 300 0.15
4MW-25/40 Large-capacity medium-pressure process air 25 4.0
4MW-100/100 PET blowing / composite autoclaves 100 10.0
DW-18/24-50 Recycle / raw material process air 18 24–50
6MW-150/50 Feed gas / raw material air supply 150 5.0
LW-9/8.7-29 Air booster compressor 9 8.7–29
Oil-Free Process Air Compressors img2

Typical Industrial Applications

Fermentation & Brewing

Large-volume low-pressure oil-free air for aerobic fermentation tanks, yeast propagation, and brewery aeration. Zero oil carryover protects food-contact integrity.

PET Bottle Blowing

2.0–4.0 MPa clean air for PET stretch blow moulding lines. Meets ISO 8573-1 Class 1; protects preform integrity across 24/7 production.

Glass Bottle Blowing

High-volume air for IS machine blank/blow sections at 0.3–0.6 MPa. Pulsation-free supply across multi-section machine banks.

Composite Material Manufacturing

Medium-pressure air for autoclave systems, filament winding, RTM, and carbon fibre curing at 2.0–6.0 MPa.

⚡

Compressed Air Energy Storage

Large-volume high-reliability air injection at 2.0–6.0 MPa into underground caverns or pressure vessels for CAES grid storage.

High-Pressure Valve & Pipeline Testing

8.0–25.0 MPa oil-free air for hydrostatic and pneumatic integrity testing rigs and safety valve calibration benches.

Environmental Pollution Control

High-pressure supply for VOC adsorption-regeneration units, ozone generation, and wastewater aeration.

️

Powder & Bulk Conveying

Dense- and dilute-phase conveying of cement, fly ash, flour, and plastic pellets at 0.1–0.6 MPa.

Handling air separation streams alongside general plant air? Our Air Separation Oxygen / Nitrogen / Argon Compressors share the same oil-free piston platform and are purpose-built for cryogenic ASU plants and PSA/VPSA systems.
Oil-Free Process Air Compressors — Typical Industrial Applications

Customer Case Studies

★★★★★

"We have been running LW series units in our preform facility for three years. Zero oil carryover, machines handled 24/7 production without issues. Commissioning was smooth and documentation thorough."

Southeast Asia · PET Packaging Manufacturer

PET blowing line air supply · 5.0 / 5

★★★★★

"Needed a high-pressure oil-free unit for valve testing up to 20 MPa. The DW-series arrived with all specified safety interlocks, passed our internal assessment, and has been in fault-free service since."

Europe · Industrial Valve Testing Facility

High-pressure valve test rig air · 5.0 / 5

★★★★★

"Specified a DW-130/8 for our carbon fibre autoclave line. Output pressure and oil-free purity were exactly right. The team also helped size interstage cooling for our local ambient conditions."

Australia · Advanced Composites Manufacturer

Composite autoclave air supply · 5.0 / 5

Oil-Free Process Air Compressors — Customer Case Studies

Frequently Asked Questions

What makes these compressors truly oil-free?
There is no lubrication oil anywhere in the compression cylinders. Piston rings and packing use self-lubricating PTFE-composite materials, so the delivered air carries zero oil — meeting ISO 8573-1 Class 0 or Class 1 without downstream coalescent filtration.
Which model range covers a 3.5 MPa PET blowing line?
At 3–4 MPa you are in the medium-pressure class. Models 4MW-25/40 and 4MW-100/100 are common starting points. Share your total flow requirement in Nm³/min (machine count × cycle rate) plus site elevation and ambient temperature for an accurate sizing.
Can these run on a VFD for variable demand?
Reciprocating piston compressors normally run at fixed speed; capacity control uses cylinder unloaders, bypass valves, or clearance pockets. Smaller ZW-series models can be VFD-supplied where torque curves allow. For highly variable demand, a multi-unit arrangement with staggered starts usually delivers better overall efficiency.
Is 6 kV motor supply a standard option?
Yes. 6 kV and 10 kV are standard from roughly the DW-60 series upward. For large units such as the HW-300/8 at 1,800 KW, high-voltage supply is preferred to keep cable cross-sections manageable. Specify your site voltage when enquiring.
How do oil-free reciprocating compressors compare with oil-free screw machines above 1 MPa?
Above 1 MPa, screw machines lose efficiency rapidly and require multi-staging. Reciprocating piston designs are more energy-efficient, reach up to 25 MPa discharge, have longer wear-part intervals, and handle variable ambient conditions more robustly. For PET blowing, high-pressure testing, and similar duties, piston technology is the industry standard.
If your facility also handles CO₂ streams — fermentation tail gas, CCUS, or dry ice production — see our CO₂ Compressors for Carbon Capture, Recovery & Liquefaction, which share the same oil-free piston manufacturing platform.

Ready to Move Forward?

Send us your process data sheet — flow rate, discharge pressure, gas composition, site elevation, and ambient temperature — and our engineering team will return a detailed technical proposal within 48 hours. Custom and non-standard configurations are actively welcomed: unusual pressure ratios, explosion-proof enclosures, turbine drive, arctic or tropical ratings, skid-mounted packages, and remote PLC monitoring.

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Certifications & Credentials

ISO 9001API 618National Class-II EnterpriseCE CertifiedClass I & II Pressure Vessel LicenceImport & Export LicenceJB/T 10683 Drafter

Factory tour

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