Air Separation Oxygen / Nitrogen / Argon Compressors

Air Separation Oxygen / Nitrogen / Argon Compressors

Oil-free reciprocating O₂, N₂, and Ar compressors for cryogenic ASU, PSA/VPSA, and high-pressure cylinder filling — 50–20,000 Nm³/h, 0.1–25 MPa. Long-term supplier to domestic and international air separation OEMs. API 618.

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Air Separation Oxygen / Nitrogen / Argon Compressors

Oil-free piston compressors for cryogenic deep-cold ASU, PSA/VPSA oxygen generation, and high-pressure industrial gas cylinder filling — one of China's primary reciprocating O₂/N₂/Ar compressor manufacturers.

Flow: 50–20,000 Nm³/hPressure: 0.1–25 MPaPower: 7.5–3,000 KWAPI 618
Air Separation Oxygen / Nitrogen / Argon Compressors

Product Overview

Ever Power has specialised in cryogenic air separation compression since the 1980s, supplying oxygen, nitrogen, and argon compressors to domestic and international ASU OEMs, industrial gas companies, and engineering contractors across more than three decades. The company is one of the primary domestic manufacturers of reciprocating O₂/N₂/Ar compressors, with a lineage of high-purity and enriched oxygen units, high-purity nitrogen units, argon compressors, and dual-medium O₂/N₂ machines. Product types include high-oxygen, high-nitrogen, high-argon, enriched-oxygen, general-purpose, and booster compressors — all manufactured to API 618 and applicable national standards.

Beyond deep-cold ASU, the range serves PSA/VPSA oxygen generation skids, medical and aviation oxygen cylinder filling (15.00–16.50 MPa), industrial nitrogen blanketing and purging, and argon recovery and re-compression loops.

Key Technical Parameters

50 – 20,000

Flow Capacity (Nm³/h)

0.1 – 25.0

Discharge Pressure (MPa)

7.5 – 3,000

Motor Power (KW)

1.5 – 150 T

Piston Force

O₂ / N₂ / Ar / Part. special gas

Media

Z / L / M / D / P

Frame Types

Oxygen Compressor — Main Technical Specifications

Oil-free oxygen compressors for air separation use. Discharge pressure: 0.10–5.00 MPa · Flow: 0.7–300 m³/min

Compression medium: O₂ (oil-free) · Voltage: 380 V or 6 kV / 10 kV
No. Model Pattern Flow (m³/min) Discharge Pressure (MPa) Power (KW) Weight (t)
1 ZW-6/2 2-col 2-stage 6 0.20 30 2
2 LW-70/2 2-col 1-stage 70 0.20 250 5
3 LW-102/2 2-col 1-stage 102 0.20 350 6.2
4 LW-35/2.5 2-col 1-stage 35 0.25 132 3.4
5 LW-33/3 2-col 1-stage 33 0.30 132 3.4
6 DW-130/3.2 2-col 2-stage 130 0.32 600 13.5
7 LW-30/3.5 2-col 1-stage 30 0.35 132 3.2
8 DW-105/3.5 2-col 2-stage 105 0.35 500 13.5
9 DW-150/4 2-col 2-stage 150 0.40 650 19
10 LW-13/5 2-col 2-stage 13 0.50 65 1.8
11 ZW-0.7/6 2-col 2-stage 0.7 0.60 11 0.80
12 LW-20/6 2-col 2-stage 20 0.60 132 3
13 LW-42/6 2-col 2-stage 42 0.60 240 (250) 4.5
14 DW-117/6 2-col 2-stage 117 0.60 630 14
15 ZW-2/7 2-col 2-stage 2 0.70 18.5 0.38
16 ZW-4.8/8 2-col 2-stage 4.8 0.80 37 2
17 ZW-5.3/8 2-col 2-stage 5.3 0.80 45 2
18 LW-10/8 2-col 2-stage 10 0.80 65 1.8
19 DW-90/8 2-col 2-stage 90 0.80 550 13
20 DW-100/8 2-col 2-stage 100 0.80 600 13
21 4MW-135/1.7-8 4-col 2-stage 135 (up to 0.17 MPa) 0.80 1,200 26
22 ZW-20/10 2-col 2-stage 20 1.00 160 5
23 3ZW-5/12 3-col 3-stage 5 1.20 55 3.5
24 LW-13.1/2 2-col 1-stage 13.1 0.20 45 1.8
25 ZW-17.2/12 2-col 2-stage 17.2 1.20 160 5
26 ZW-3/15 2-col 2-stage 3 1.50 37 2
27 ZW-4.5/15 2-col 2-stage 4.5 1.50 45 2
28 LW-6/15 2-col 2-stage 6 1.50 65 1.8
29 LW-10/15 2-col 2-stage 10 1.50 110 3
30 ZW-14/15 2-col 2-stage 14 1.50 160 5
31 LW-24/16 2-col 2-stage 24 1.60 250 6.6
32 ZW-4/30 (skid) 3-col 3-stage 4 3.00 55 4
33 3ZW-6/30 3-col 3-stage 6 3.00 75 3
34 LW-7/30 3-col 3-stage 7 3.00 75 2.7
35 3ZW-9.5/30 3-col 3-stage 9.5 3.00 110 3.5
36 LW-9.5/30 3-col 3-stage 9.5 3.00 110 3.7
37 LW-10/30 3-col 3-stage 10 3.00 132 3.7
38 ZW-13/30 (skid) 3-col 3-stage 13 3.00 160 6
39 LW-13/30 (skid) 3-col 3-stage 13 3.00 160 6.6
40 LW-17/30 3-col 3-stage 17 3.00 220 5
41 LW-20/30 3-col 3-stage 20 3.00 240 6
42 LW-33/30 3-col 3-stage 33 3.00 350 6.6
43 DW-43/30 2-col 4-stage 43 3.00 550 13
44 DW-50/30 2-col 4-stage 50 3.00 550 13
45 DW-55/30 2-col 4-stage 55 3.00 630 13
46 DW-60/30 2-col 4-stage 60 3.00 650 17
47 DW-70/30 2-col 4-stage 70 3.00 850 17
48 4MW-80/30 4-col 4-stage 80 3.00 900 26
49 4MW-100/30 4-col 4-stage 100 3.20 (0.843 MPa inlet) 1,200 26.5
50 DW-35/0.45-32 2-col 3-stage 35 (inlet 0.045 MPa) 3.20 500 15

High-Pressure Oxygen / Nitrogen Cylinder Filling Compressors (15.00–16.50 MPa)

High-pressure filling compressors — O₂, N₂, Ar · 15.00–16.50 MPa · Motor: 380 V
No. Model Gas Flow (m³/min) Discharge Pressure (MPa) Power (KW)
1 ZW-1/150 O₂ (oil-free) 1 15.00 30
2 ZW-1/165 O₂ (oil-free) 1 16.50 30
3 ZW-1.67/150 O₂ (oil-free) 1.67 15.00 37
4 ZW-1.67/165 O₂ (oil-free) 1.67 16.50 37
5 ZW-1.82/150 O₂ (oil-free) 1.82 15.00 45
6 ZW-1.82/165 O₂ (oil-free) 1.82 16.50 45
7 ZW-3/150 O₂ (oil-free) 3 15.00 55
8 ZW-3/165 O₂ (oil-free) 3 16.50 55
9 ZW-3.3/150 O₂ (oil-free) 3.3 15.00 55
10 ZW-3.3/165 O₂ (oil-free) 3.3 16.50 55
11 ZW-4.2/150 O₂ (oil-free) 4.2 15.00 75
12 ZW-4.2/165 O₂ (oil-free) 4.2 16.50 75
13 ZW-5/165 O₂ (oil-free) 5 16.50 90
14 ZW-5/150 O₂ (oil-free) 5 15.00 90
15 ZW-1/150 N₂ N₂ (oil-free) 1 15.00 30
16 ZW-1/165 N₂ N₂ (oil-free) 1 16.50 30
17 ZW-1.67/150 N₂ N₂ (oil-free) 1.67 15.00 37
18 ZW-1.67/165 N₂ N₂ (oil-free) 1.67 16.50 37
19 ZW-1.82/150 N₂ N₂ (oil-free) 1.82 15.00 45
20 ZW-1.82/165 N₂ N₂ (oil-free) 1.82 16.50 45
21 ZW-3/150 N₂ N₂ (oil-free) 3 15.00 55
22 ZW-3/165 N₂ N₂ (oil-free) 3 16.50 55
23 ZW-3.3/150 N₂ N₂ (oil-free) 3.3 15.00 55
24 ZW-3.3/165 N₂ N₂ (oil-free) 3.3 16.50 55
25 ZW-1/150 Ar Ar (oil-free) 1 15.00 30
26 ZW-1.34/150 Ar Ar (oil-free) 1.34 15.00 37
27 ZW-1.67/150 Ar Ar (oil-free) 1.67 15.00 37
28 ZW-1.82/150 Ar Ar (oil-free) 1.82 15.00 45
29 ZW-3/150 Ar Ar (oil-free) 3 15.00 55
30 ZW-4.2/150 Ar Ar (oil-free) 4.2 15.00 75
31 ZW-5/150 Ar Ar (oil-free) 5 15.00 90
Air Separation Oxygen / Nitrogen / Argon Compressors — High-Pressure Oxygen / Nitrogen Cylinder Filling Compressors (15.00–16.50 MPa)

Representative Large ASU Models

Model Medium Flow (m³/min) Discharge Pressure (MPa)
4ZW-84/30 O₂/N₂ 84 3.0
4MW-93/35 O₂/N₂ 93 3.5
DW-40/4.9-10 Recycle O₂ 40 4.9–10
ZW-30/7-12 N₂ 30 7–12
3ZW-1.2/7-100 O₂ 1.2 7–100
ZW-2.5/3 O₂/N₂ 2.5 0.30
3ZW-47/15 N₂ 47 1.50
LW-42/8 O₂/N₂ 42 0.80
ZW-6/8 O₂/N₂ 6 0.80

Applications

Cryogenic ASU Product Gas Compression

Boosting separated O₂ and N₂ streams from the cold box to pipeline or storage pressure in deep-cold air separation plants.

⚙️

PSA / VPSA Oxygen Generation

Feed air and product oxygen compression in medical, aquaculture, wastewater treatment, and combustion enhancement PSA/VPSA systems.

Steel, Glass & Non-Ferrous Smelting

High-purity and enriched oxygen supply for electric arc furnaces, basic oxygen steelmaking, glass melting, and copper converters.

Food & Beverage Nitrogen Blanketing

High-purity nitrogen compression for modified-atmosphere packaging, beverage de-aeration, and cold-chain purging.

Medical & Aviation O₂ Cylinder Filling

15.00–16.50 MPa oil-free oxygen filling for medical-grade and aviation-grade cylinders per pharmacopoeia standards.

Electronics & Semiconductor

High-purity nitrogen for wafer chamber purging, reflow soldering, and LCD panel manufacturing in Class-100 clean-room environments.

Argon Recovery & Recompression

Argon recovery from ASU argon columns and re-compression for welding, metallurgical, and specialty chemical applications.

Environmental & Wastewater

Enriched oxygen supply for aerobic wastewater bioreactors and ozone generation systems.

For PSA/VPSA-specific oxygen, hydrogen, and CO compression duties, see our PSA/VPSA Process Gas Compressors — designed for the variable-pressure, high-cycle-count demands of adsorption-based separation systems.
Air Separation Oxygen / Nitrogen / Argon Compressors — Applications

Customer Case Studies

★★★★★

"We installed DW-90/8 oxygen compressors to boost ASU product oxygen from 0.5 MPa to 0.8 MPa for lance injection. Volumetric efficiency has remained above 94% over 18 months. Piston ring life exceeded the predicted 6,000-hour interval."

China · Steel Plant (EAF)

Oxygen boosting for electric arc furnace · 5.0 / 5

★★★★★

"The ZW-3/150 units we commissioned for medical oxygen filling have run without unplanned downtime for over two years. Oil-free purity is verified quarterly and consistently meets BP and Ph. Eur. standards."

Malaysia · Medical Gas Cylinder Filling Station

O₂ cylinder filling at 15 MPa · 5.0 / 5

★★★★☆

"We needed reliable high-purity nitrogen at 0.8 MPa for 12 packaging lines running three shifts. The LW-42/6 units were sized to our peak demand with 20% headroom. Energy consumption has been noticeably lower than our previous oil-injected screws plus membrane system."

Turkey · Food Packaging Manufacturer

High-purity N₂ for MAP packaging · 4.0 / 5

Air Separation Oxygen / Nitrogen / Argon Compressors — Customer Case Studies

Frequently Asked Questions

Why use reciprocating compressors for oxygen rather than centrifugal machines?
Centrifugal compressors are efficient at high flow and moderate pressure but lose viability below roughly 3,000 Nm³/h or above 3 MPa. Reciprocating piston compressors handle wide flow ranges efficiently, reach 25 MPa, and their oil-free design eliminates the hydrocarbon ignition risk that is critical in oxygen service.
What materials are used to ensure safe oxygen service?
Oxygen-compatible materials are used throughout — cylinder bodies and piston rings in bronze, PTFE, and stainless steel as appropriate; valve components selected to minimise adiabatic compression risk; cleaning procedures per ASTM G93 or equivalent; and pressure-rated PTFE-composite packing to prevent hydrocarbon contamination.
Can these compressors serve dual O₂/N₂ duty simultaneously?
Yes. Dual-medium models such as the 4MW-93/35 and 4ZW-84/30 are designed for simultaneous oxygen and nitrogen compression from a single driver, allowing ASU operators to maximise the value of installed power.
What is the maximum operating pressure for oxygen cylinder filling?
High-pressure filling models such as the ZW-1/165 and ZW-1.67/165 series operate up to 16.50 MPa, covering standard 150 bar and 200 bar oxygen cylinder filling specifications.
How are these compressors maintained in oxygen service?
Scheduled maintenance intervals are typically 4,000–8,000 operating hours for piston ring inspection and replacement. All maintenance must be performed with strict oxygen-clean procedures — no hydrocarbon lubricants, degreasers, or tools with hydrocarbon residues. Full maintenance manuals and spare parts kits are supplied with each unit.
Sourcing oxygen and hydrogen compression for the same facility? Our Hydrogen & Hydrogen Energy Compressors complement this range with a full suite of oil-free hydrogen process, circulating, and storage compressors.

Ready to Move Forward?

Tell us your O₂, N₂, or Ar flow and pressure requirements — including ASU type, purity specification, cylinder filling capacity, or PSA/VPSA configuration — and we will size the right compressor and return a formal technical quotation within 48 hours.

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