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The DWF-4.1/(18~25)-45 reciprocating piston compressor is a medium-high pressure model for natural gas boosting in industrial gas processing and transportation, capable of stable pressurization during long-term continuous operation.
It features a nominal volumetric flow of 4.1m³/min with an actual gas handling capacity of 95,000–135,000 Nm³/h. Under normal temperature conditions, it operates with an inlet pressure range of 1.8~2.5MPa(G) and delivers a rated discharge pressure of 4.5MPa(G), driven by a 200kW motor rated at 740r/min.
The fully integrated skid-mounted unit measures 6200×2900×2300mm and weighs 14 tons, enabling easy on-site pipeline connection and consistent long-term operation.
The DWF-4.1/(18~25)-45 uses a D-type symmetrical balanced structure.
Different from conventional reciprocating arrangements, the balanced design helps reduce the influence of reciprocating forces during operation.
The main structural features include:
D-type symmetrical cylinder arrangement
Single-stage two-cylinder configuration
Reciprocating piston compression
Oil-free compression chamber
Forced air cooling system
This configuration provides a compact layout while maintaining stable mechanical operation.
For natural gas applications, controlling gas quality is important.
The DWF-4.1/(18~25)-45 adopts an oil-free lubrication design, separating lubrication components from the compression chamber.
The design helps to:
Reduce oil contamination risk
Maintain cleaner compressed natural gas
Protect downstream gas equipment
The PTFE-filled packing components support sealing performance during long-term operation.
Stable Operation & High Safety: Matched forced air cooling restricts exhaust temperature below 125℃. Complete pressure lubrication safeguards all moving assemblies. Equipped with ExdIIBT4 explosion-proof motor, Siemens S7-1200 PLC and Weinview touch screen, it realizes real-time parameter monitoring and automatic fault alarm & shutdown, satisfying safety standards for natural gas hazardous working areas.
Easy Installation & Maintenance: High-rigidity integrated skid base cuts on-site construction work. Built-in manual turning device, matched wearing spares and dedicated maintenance tools effectively shorten equipment downtime.
Strong Environmental Adaptability:Adaptable to ambient temperature of -20℃~+45℃. Equipped with oil circuit heat preservation, electric tracing and low-temperature oil heater to sustain stable natural gas supply under severe temperature fluctuations.
Patent Certificates
 | A piston rod thread protective sleeve ZL 2017 2 1907021.7 | | A piston ring support device ZL 2018 2 0294776.2 | |
| A range piston ZL 2017 2 190177.0 for symmetrical balanced compressors | | Integrated long short double compartment ZL 2018 2 0294762.0 |
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The compressor in this picture is a non-standard product. The product provides independent solutions tailored to customers' specific usage requirements (flow rate/purity/pressure, usage environment, main purpose, and customer specific requirements), from design to product customization.
Structural form: D-type/M-type/S-type/W-type/V-type/Z-type
Cooling method: water cooling/air cooling/mixed cooling
Installation form: fixed/mobile/pry mounted/cabin type
Drive mode: motor drive/diesel engine start
Transportation: sea/air/land
Packaging:
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| Metal cabin | Wooden box | Soundproof cabin |
Project Case
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| Lanzhou petrochemical company 240000 tonsyear ethylene production capacity restoration - adding butadiene and 1-butene unloading facilities project | Alibek oilfield in Southern Kazakhstan | Procurement of Molecular Sieve Dehydration, Ethylene Glycol Regeneration and Injection Device, and Fuel Gas Skid in Akimom Gas Field |
Technical Parameter
| No. | Model | Medium | Flow rate (Nm3/h) | Exhaust pressure MPa | Motor power (kW) | Cooling method | Overall dimensions (mm) | Weights (kg) | |
| 1 | VW-3.5/1-18 | Natural gas | 420 | 1.8 | 55 | Closed water coole | d 4000×1800×2200 | 5000 | |
| 2 | DF-0.4/（2～6）-250 | Natural gas | 160 | 25 | 30 | Air-cooled | 2800×1800×1500 | 3500 | |
| 3 | DFD-1.36/(30～50)-250 | Natural gas | 4167 | 25 | 315 | Air-cooled | 8500×3700×4100 | 22000 | |
| 4 | DFW-3.7/(8～12)-52 | Natural gas | 2083 | 5.2 | 200 | Air-cooled | 6000×3400×2300 | 15000 | |
| 5 | DFW-5.3/3-15 | Natural gas | 1100 | 1.5 | 90 | Air-cooled | 6500×3000×2500 | 6000 | |
| 6 | DFWD-5.7/(0. 1～0.5)-40 | Natural gas | 75～365 | 4 | 90 | Air-cooled | 7000×3400×2500 | 100000 | |
| 7 | DFWD-5/(1.5～3.6)-14.2 | Natural gas | 700 | 1.42 | 90 | Air-cooled | 5000×3200×2200 | 6500 | |
| 8 | DW-9/3-35 | Natural gas | 2000 | 3.5 | 250 | Air-cooled | 4800×4000×2000 | 13000 | |
| 9 | MFWD-7/(10～30)-35 | Natural gas | 6250 | 3.5 | 315 | Air-cooled | 6300×3200×3200 | 16000 | |
| 10 | VF-1.4/(5～7)-250 | Natural gas | 500 | 25 | 110 | Air-cooled | 5000×2400×2100 | 6800 | |
The DWF-4.1/(18~25)-45 is designed for natural gas pressure boosting applications, including pipeline systems, oil and gas field gas utilization, and industrial energy projects requiring increased gas pressure.
The D-type balanced structure helps reduce vibration caused by reciprocating movement and improves mechanical stability during continuous high-pressure natural gas compression.
The oil-free design reduces the possibility of lubricating oil entering the compression chamber, helping maintain cleaner natural gas and making the compressor suitable for gas systems with higher cleanliness requirements.
The DWF-4.1/(18~25)-45 provides a flow rate of 4.1m³/min, operates with an inlet pressure of 1.8~2.5MPa.G, and delivers compressed natural gas at 4.5MPa.G discharge pressure.
