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| No. | Model | Gas | Pattern | Capacity (m³/min) | Pressure (MPa) | Size L x W x H (mm) | Weight (t) | Power (kW) | Voltage (V) |
|---|---|---|---|---|---|---|---|---|---|
| 1 | ZW-1/150 O2 | Oxygen | 2-row 4-stage | 1 | 15.00 | 2495 x 1800 x 2945 | 4.00 | 30 | 380 |
| 2 | ZW-1/165 O2 | Oxygen | 2-row 4-stage | 1 | 16.50 | 2495 x 1800 x 2945 | 4.00 | 30 | 380 |
| 3 | ZW-1.67/150 O2 | Oxygen | 2-row 4-stage | 1.67 | 15.00 | 2495 x 1800 x 2945 | 4.00 | 37 | 380 |
| 4 | ZW-1.67/165 O2 | Oxygen | 2-row 4-stage | 1.67 | 16.50 | 2495 x 1800 x 2945 | 4.00 | 37 | 380 |
| 5 | ZW-1.82/150 O2 | Oxygen | 2-row 4-stage | 1.82 | 15.00 | 2495 x 1800 x 2945 | 4.00 | 37 | 380 |
| 6 | ZW-1.82/165 O2 | Oxygen | 2-row 4-stage | 1.82 | 16.50 | 2495 x 1800 x 2945 | 4.00 | 45 | 380 |
| 7 | 3ZW-3/165(150) | O2/N2 | 3-row 5-stage | 3 | 16.50 (15.00) | 2575 x 2064 x 3407 | 4.50 | 55 | 380 |
| 8 | 3ZW-3/165 O2 | Oxygen | 3-row 5-stage | 3 | 16.50 | 2575 x 2064 x 3407 | 4.50 | 55 | 380 |
| 9 | ZW-3.3/150 O2 | Oxygen | 3-row 5-stage | 3.3 | 15.00 | 2575 x 2064 x 3407 | 4.80 | 55 | 380 |
| 10 | ZW-3.3/165 O2 | Oxygen | 3-row 5-stage | 3.3 | 16.50 | 2575 x 2064 x 3407 | 4.80 | 55 | 380 |
| 11 | ZW-4.2/150 O2 | Oxygen | 3-row 5-stage | 4.2 | 15.00 | 2900 x 2300 x 3500 | 5.60 | 75 | 380 |
| 12 | ZW-4.2/165 O2 | Oxygen | 3-row 5-stage | 4.2 | 16.50 | 2900 x 2300 x 3500 | 5.60 | 75 | 380 |
| 13 | ZW-5/150 O2 | Oxygen | 3-row 5-stage | 5 | 15.00 | 2900 x 2300 x 3500 | 5.60 | 90 | 380 |
| 14 | ZW-5/165 O2 | Oxygen | 3-row 5-stage | 5 | 16.50 | 2900 x 2300 x 3500 | 5.60 | 90 | 380 |
| 15 | ZW-1/150 N2 | Nitrogen | 2-row 4-stage | 1 | 15.00 | 2495 x 1800 x 2945 | 4.00 | 30 | 380 |
| 16 | ZW-1/165 N2 | Nitrogen | 2-row 4-stage | 1 | 16.50 | 2495 x 1800 x 2945 | 4.00 | 30 | 380 |
| 17 | ZW-1.67/150 N2 | Nitrogen | 2-row 4-stage | 1.67 | 15.00 | 2495 x 1800 x 2945 | 4.00 | 37 | 380 |
| 18 | ZW-1.67/165 N2 | Nitrogen | 2-row 4-stage | 1.67 | 16.50 | 2495 x 1800 x 2945 | 4.00 | 37 | 380 |
| 19 | ZW-1.82/150 N2 | Nitrogen | 2-row 4-stage | 1.82 | 15.00 | 2495 x 1800 x 2945 | 4.00 | 37 | 380 |
| 20 | ZW-1.82/165 N2 | Nitrogen | 2-row 4-stage | 1.82 | 16.50 | 2495 x 1800 x 2945 | 4.00 | 45 | 380 |
| 21 | ZW-3/150 N2 | Nitrogen | 3-row 5-stage | 3 | 15.00 | 2575 x 2064 x 3407 | 4.50 | 55 | 380 |
| 22 | ZW-3/165 N2 | Nitrogen | 3-row 5-stage | 3 | 16.50 | 2575 x 2064 x 3407 | 4.50 | 55 | 380 |
| 23 | ZW-3.3/150 N2 | Nitrogen | 3-row 5-stage | 3.3 | 15.00 | 2575 x 2064 x 3407 | 4.80 | 55 | 380 |
| 24 | ZW-3.3/165 N2 | Nitrogen | 3-row 5-stage | 3.3 | 16.50 | 2575 x 2064 x 3407 | 4.80 | 55 | 380 |
| 25 | ZW-4.2/150 N2 | Nitrogen | 3-row 5-stage | 4.2 | 15.00 | 2900 x 2300 x 3500 | 5.60 | 75 | 380 |
| 26 | ZW-4.2/165 N2 | Nitrogen | 3-row 5-stage | 4.2 | 16.50 | 2900 x 2300 x 3500 | 5.60 | 75 | 380 |
| 27 | ZW-5/150 N2 | Nitrogen | 3-row 5-stage | 5 | 15.00 | 2900 x 2300 x 3500 | 5.60 | 90 | 380 |
| 28 | ZW-5/165 N2 | Nitrogen | 3-row 5-stage | 5 | 16.50 | 2900 x 2300 x 3500 | 5.60 | 90 | 380 |
| 29 | ZW-1/150 H2 | Hydrogen | 2-row 4-stage | 1 | 15.00 | 2495 x 1800 x 2945 | 4.00 | 30 | 380 |
| 30 | ZW-1.34/150 H2 | Hydrogen | 2-row 4-stage | 1.34 | 15.00 | 2495 x 1800 x 2945 | 4.00 | 37 | 380 |
| 31 | ZW-1.67/150 H2 | Hydrogen | 2-row 4-stage | 1.67 | 15.00 | 2495 x 1800 x 2945 | 4.00 | 37 | 380 |
| 32 | ZW-1.82/150 H2 | Hydrogen | 2-row 4-stage | 1.82 | 15.00 | 2495 x 1800 x 2945 | 4.00 | 37 | 380 |
| 33 | ZW-3.3/150 H2 | Hydrogen | 3-row 5-stage | 3.3 | 15.00 | 2575 x 2064 x 3407 | 4.80 | 55 | 380 |
| 34 | ZW-4.2/150 H2 | Hydrogen | 3-row 5-stage | 4.2 | 15.00 | 2900 x 2300 x 3500 | 5.60 | 75 | 380 |
| 35 | ZW-5/150 H2 | Hydrogen | 3-row 5-stage | 5 | 15.00 | 2900 x 2300 x 3500 | 5.60 | 90 | 380 |
High-pressure cylinder filling at 15 to 20 MPa is one of the most technically demanding applications in industrial gas compression. The combination of high absolute pressure, pure oxygen or high-purity nitrogen gas, and the requirement for zero oil contamination in the filled cylinder creates a set of design constraints that eliminate most standard compressor designs from consideration. The 3ZW-3/165 is designed specifically for this service: a 3-row 5-stage oil-free reciprocating compressor delivering 3 m3/min at 16.5 MPa, with anti-static belt drive, oxygen-compatible materials throughout, and individual stage temperature monitoring on all five stages.
The 3-row cylinder arrangement of the 3ZW-3/165 distributes the five compression stages across three cylinder rows, with each row handling either one or two stages in sequence. This arrangement keeps the machine footprint compact while accommodating the five separate cylinder bores required for 5-stage compression - a constraint that makes 5-stage high-pressure compressors physically larger than 2 or 3 stage designs at the same final pressure, but which is not negotiable for safe oxygen compression at 16.5 MPa. The belt drive configuration allows the motor to be positioned away from the compression assembly, reducing the heat transferred from the motor to the compressor frame and keeping the operating environment around the high-pressure cylinders cooler than direct-drive alternatives.
PTFE composite piston rings are used in all five stages. The PTFE compound grade is selected for each stage individually: lower-pressure stages use glass-fibre-reinforced PTFE providing good wear resistance at moderate contact pressures; higher-pressure stages use carbon-graphite-filled PTFE compounds providing better dimensional stability and lower wear rates under the elevated contact stresses of high-pressure cylinder conditions. This stage-specific ring selection extends the overall maintenance interval between ring replacement events compared to using a single ring grade across all stages.
All valve components across all five stages are fabricated from oxygen-compatible alloy steels with verified composition and hardness. Valve seats use PEEK polymer inserts in the high-pressure stages where PTFE seat deflection under pressure would compromise sealing integrity. The complete valve specification for all five stages is documented in the oxygen-service materials certificate supplied with every 3ZW-3/165.
The filling manifold system includes pre-set pressure relief protection, cylinder connection isolation valves, and a filling pressure gauge calibrated for the maximum cylinder working pressure of 15.0 MPa. A cascade filling option allows connection of multiple cylinder banks at different fill states, maximising filling efficiency by sequential pressure equalisation before final top-up compression.
Dissolved acetylene plant oxygen supply: Dissolved acetylene production requires oxygen for combustion in acetylene generators at some plant configurations. The 3ZW-3/165 provides the oxygen supply compression for small to medium dissolved acetylene plants requiring oxygen at 12 to 16 MPa for generator lance supply.
Breathing air and diving supply: Commercial diving operations, fire brigade breathing apparatus filling centres, and industrial breathing air supply systems require oil-free high-pressure compression for breathing gas cylinders. The 3ZW-3/165 oil-free design with verified clean gas discharge covers the compression requirement for breathing gas applications requiring high-pressure oil-free gas supply.
Calibration gas production: Analytical instrument calibration gas producers requiring precise mixtures of oxygen and nitrogen at high pressure use the 3ZW-3/165 as the compression stage for filling calibration gas cylinders, where oil-free gas quality is essential to prevent contamination of reference gas mixtures.
Emergency services and fire brigade: Fire brigade compressed air cylinder filling and rescue breathing apparatus filling operations require reliable, oil-free high-pressure compression. The 3ZW-3/165 compact design and 380V supply make it suitable for installation in existing fire station or emergency services facilities without civil modifications or specialist electrical supply.
Industrial equipment testing: Pressure testing of valves, fittings, pressure vessels, and hydraulic components using nitrogen at 10 to 15 MPa requires a reliable high-pressure nitrogen source. The 3ZW-3/165 in nitrogen service provides the compression capacity for a medium-scale pressure testing facility testing multiple components per shift.
Comparison with Similar Products:
Several specialist manufacturers supply high-pressure oil-free reciprocating compressors for oxygen and nitrogen cylinder filling in the 2 to 4 m3/min class and 15 to 20 MPa pressure range, serving the industrial gas, medical gas, and diving equipment markets globally. The 3ZW-3/165 provides 5-stage compression with stage-specific PTFE ring selection for optimised wear resistance at each pressure level, PEEK valve seats in high-pressure stages for improved sealing reliability, anti-static belt drive as standard equipment, full 5-stage oxygen-service material certification, and ISO 9001 manufacturing quality at a competitive capital cost with direct factory spare parts support covering all five stage consumable items as a complete annual maintenance kit.
EVER POWER is a national second-level enterprise and a provincial advanced enterprise. Xinlan Company currently has over 350 employees, total assets of 300 million RMB, and more than 600 sets of various production and processing equipment. The company has specialized production plants including a foundry, machining plant, pressure vessel plant, and assembly plant, as well as functional departments such as a compressor research institute, sales department, marketing department, customer service office, finance department, manufacturing department, supply department, process equipment department, and general office.
EVER POWER produces nearly a thousand varieties of compressors, which are now widely used in industries such as petrochemicals, air separation and cryogenics, energy conservation and environmental protection, coal mining, food fermentation, and glass building materials. Its products enjoy a high reputation domestically and are exported to many countries.
EVER POWER focuses on the design and manufacturing of reciprocating compressors and Class I, II, and III pressure vessels. Its compressor products are currently divided into two main categories: reciprocating and screw compressors. The reciprocating compressors currently include numerous series such as M, H, D, L, P, and Z. Our products cover a single-unit pressure range of 0.1~600 Nm³/min; a pressure range of 0.1~32.0 MPa; a piston force of 1.5~50T; and a drive power of 5.5~5000 KW. Compressible media include: air, gas, oxygen, carbon dioxide, carbon monoxide, natural gas, methane, coke oven (blast furnace) gas, coalbed methane, biogas, acetylene, chloromethane, vinyl chloride, mixed gases, liquefied petroleum gas, petroleum-associated gases, and various flammable and explosive raw material gases. Our company aims to become one of the largest and most comprehensive manufacturers of large and medium-sized reciprocating process compressors in China.
EVER POWER offers customized compressor system solutions for different scales, based on the design concepts of equipment integration, energy-saving operation, intelligent control, and convenient maintenance. Integrated skid-mounted power systems can be provided according to customer needs, with optional soft start, PLC control, frequency converter systems, and remote and wireless monitoring systems. We can provide designs for special working conditions and environments such as outdoor, low temperature, high altitude, and marine environments, as well as supporting power designs such as electric motors, internal combustion engines, and steam turbines.
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