Gas composition (mol%): Hydrogen gas 99%%, with trace amounts of fatty acids
Flow rate: 65.3Nm ³/min
Inlet pressure: 2.3MPa. G;
Inlet temperature: 70 ℃
Exhaust pressure: 2.8MPa. G;
Main motor power: 75kW
Overall dimensions of the machine: ~3200 × 3000 × 1850 mm
Whole machine weight: ~5.8T
DW-3.4 23-28
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The DW-3.4 / 23-28 Hydrogen Compressor, manufactured by Bengbu United Compressor (a leading China-based manufacturer), is engineered to meet the demanding needs of hydrogen processing, storage, and utilization. Designed as a D-type (symmetrical balanced), water-cooled, oil-free lubricated reciprocating piston compressor, it features 2-row, 3-stage compression and modular supply, ensuring seamless integration into various industrial setups.
This high-performance compressor handles a medium composition of 99% hydrogen with trace fatty acids, making it ideal for pure hydrogen applications. Key operational parameters include a processing capacity of 65.3Nm³/min, inlet pressure of 2.3MPa.G, inlet temperature of 70℃, and discharge pressure of 2.8MPa.G, powered by a 75kW main motor. With overall dimensions of approximately 3200 × 3000 × 1850 mm and a weight of ~5.8T, it balances robust performance with manageable installation requirements.
Widely applied in hydrogen power generation, energy storage, heating systems, and fuel cell vehicles, this compressor plays a critical role in compressing hydrogen to high pressures for fuel cell operations, storing it in high-pressure cylinders or underground tanks, and enabling efficient hydrogen delivery in heating systems. Its adaptability also extends to custom scenarios, supporting industries from renewable energy to transportation.
The DW-3.4 / 23-28 Hydrogen Compressor boasts high automation levels and exceptional reliability, minimizing downtime in continuous operations. Its oil-free lubrication design ensures the compressed hydrogen remains uncontaminated, a critical feature for applications requiring high purity, such as fuel cells. The crankcase, crafted from gray cast iron, integrates lubricant storage and multiple functional ports (oil drain, temperature measurement), enhancing operational stability.
Equipped with fewer vulnerable parts, the compressor reduces maintenance frequency and costs. Its low vibration and noise levels create a safer, more comfortable working environment. The main and auxiliary components are mounted on a skid, simplifying transportation and on-site installation—an advantage for projects with tight timelines or remote locations.
Featuring a double intermediate body structure, the compressor prevents oil from migrating from the crankcase to the cylinder, safeguarding medium purity. Cylinders and cylinder heads, made from gray cast iron or forged steel, adopt axial valve arrangement for efficient gas flow. This design, combined with patents such as the piston rod thread protective sleeve (ZL 2017 2 1907021.7) and integrated long-short double compartment (ZL 2018 2 0294762.0), underscores its innovative engineering.
Beyond standard specifications, the compressor offers tailored solutions based on client needs, including flow rate, purity, pressure, operating environment, and specific use cases. It supports various structural forms (D-type, M-type, S-type, etc.), cooling methods (water-cooled, air-cooled, mixed cooling), and installation types (fixed, mobile, skid-mounted, cabin-type), ensuring compatibility with diverse industrial requirements.
Highlight Advantages
 |  |  |  |
| Has high efficiency, strong reliability, and high degree of automation; | Less vulnerable parts, low vibration, low noise, and easy operation and maintenance | The main and auxiliary equipment of the compressor are all installed on the sled, running smoothly and reliably. The overall sled installation is convenient for the transportation and installation of the compressor | The entire machine components are carefully designed |
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 |
Whole Machine Description
The compressor adopts D-type (symmetrical balance type), water-cooled, oil-free lubrication, reciprocating piston type, 2-row 3-stage compression, and the entire unit is supplied in a modular manner.
The compressor crankcase is made of gray cast iron and has four holes of different diameters for installing crosshead slides, bearings, and bearing seats. The lower part of the crankcase can store lubricating oil for the compressor to lubricate; The upper surface of the crankcase has an interface for installing a fuel inlet (breathing port) cover plate; In addition, the crankcase also has spare interfaces such as oil drain port, oil gauge observation port, bearing seat oil injection port, and installation oil temperature measurement port. The oil drain port of the crankcase has been connected to the outside of the compartment and is equipped with a manual ball valve for oil discharge from the crankcase.
The middle body of the compressor is a double middle body structure, ensuring that the middle body space is greater than one stroke, preventing compressor oil from entering the cylinder from the crankcase, thus ensuring that compressor oil does not contaminate the medium. The material of the compressor cylinder is gray cast iron/forged steel, and it adopts an oil-free lubrication design, which does not require oil lubrication. The cylinder head material is gray cast iron/forged steel, and the air valves are arranged axially on the cylinder head.
 |  |
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:
 |  |  |
| Metal cabin | Wooden box | Soundproof cabin |
Technical Parameter
| No. | Model | Medium | Flow rate (Nm3/h) | Exhaust pressure (MPa.G) | Motor power (kW) | Cooling method | Overall dimensions (mm) | Weights (kg) | |
| 1 | DW-1.6/(8～12)-120 | Hydrogen | 800 | 12 | 160 | Water-cooled | 5800×3000×2300 | 8500 | |
| 2 | DW-1.8/15-30 | Hydrogen | 1500 | 3.0 | 75 | Water-cooled | 3200×3000×1850 | 5800 | |
| 3 | DW-6.74(3.3)/0.7(5～12)-12 | Hydrogen | 600 | 1.2 | 90 | Water-cooled | 5000×3200×2100 | 8000 | |
| 4 | DW-17.9/(4～5)-6.5 | Hydrogen | 1270 | 0.65 | 132 | Water-cooled | 3500×3000×2300 | 8000 | |
| 5 | DW-1.8/15-30 | Hydrogen | 1500 | 3.0 | 75 | Water-cooled | 3200×3000×1850 | 5800 | |
| 6 | DW-9.55/0.03-16 | Hydrogen | 515 | 1.6 | 90 | Water-cooled | 3500×3200×2500 | 6500 | |
| 7 | DW-96.5/（ 15～23 ）-（ 21~ 29） | Hydrogen | 4500 | 2. 1～2.9 | 185 | Water-cooled | 5000×3000×2500 | 12000 | |
| 8 | DW-48/（ 15～23 ）-（ 21~29） | Hydrogen | 2642～4500 | 2. 1～2.9 | 55 | Water-cooled | 4000×2700×2300 | 6000 | |
| 9 | D-0.57/16-200 | Hydrogen | 500 | 20 | 75 | Water-cooled | 5800×3200×2350 | 9000 | |
| 10 | ZW-0. 18/15-22 | Hydrogen | 150 | 2.2 | 11 | Water-cooled | 2200×1600×1700 | 2000 | |
| 11 | ZW-0.82/(6～8)-20 | Hydrogen | 300 | 2.0 | 22 | Water-cooled | 2500×1500×1750 | 2000 | |
| 12 | W-3/0.1-150 | Hydrogen | 212 | 15 | 55 | Water-cooled | 6000×2700×2100 | 15000 | |
| 13 | MW-7.7/9.8-40 | Hydrogen | 4200 | 4.0 | 355 | Water-cooled | 7500×3600×2000 | 22000 | |
| 14 | MW-25.2/（1.5～1.7）-10 | Hydrogen | 3300 | 1.0 | 315 | Water-cooled | 8000×3000×2200 | 20000 | |
| 15 | PW-0.6/(10～15)-30 | Hydrogen | 0~560 | 3.0 | 30 | Mixed cooling | 2200×1800×1600 | 1800 | |
| 16 | PW-13.7/17-25 | Hydrogen | 820 | 2.5 | 30 | Mixed cooling | 4000×2700×2300 | 6000 | |
| 17 | D-0.26/（28～31）-150 | Hydrogen | 400 | 15 | 45 | Mixed cooling | 3800×3200×1950 | 4800 | |
| 18 | PW-13.7/17-25 | Hydrogen | 820 | 2.5 | 30 | Mixed cooling | 4000×2700×2300 | 6000 | |
| 19 | VW-14.3/7 | Hydrogen | 750 | 0.7 | 110 | Mixed cooling | 4800×2250×2100 | 8000 | |
| 20 | DW-7.6/（4～5.7）-6.5 | Hydrogen | 2000 | 0.65 | 55 | Mixed cooling | 3500×3000×2300 | 6000 | |
Project Case
 |  |  |
| Procurement of Molecular Sieve Dehydration, Ethylene Glycol Regeneration and Injection Device, and Fuel Gas Skid in Akimom Gas Field | Zaozhuang CNG compressor project of Chengdu Shenliang Technology Co., Ltd. | Ningxia Zhongneng new materials engineering |
This compressor is widely used in hydrogen power generation (compressing hydrogen for fuel cell electricity production), energy storage (high-pressure hydrogen storage for grid stabilization), heating systems (delivering hydrogen at required pressures), and fuel cell vehicles (supplying compressed hydrogen to on-board fuel cells). It also serves renewable energy projects and industrial hydrogen processing lines.
Oil-free lubrication ensures no compressor oil contaminates the hydrogen medium, which is vital for maintaining 99%+ hydrogen purity—a strict requirement in fuel cells, semiconductor manufacturing, and other high-purity applications. This design eliminates the need for oil separation systems, reducing operational complexity and costs.
Yes. Bengbu United Compressor provides end-to-end customization, from design to production, based on client requirements such as flow rate (up to 4500Nm³/h for related models), pressure (ranging from 0.65MPa to 20MPa), operating temperature, and environmental conditions. Options include different cooling methods, structural forms, and packaging (metal cabins, soundproof cabins) to fit unique project needs.
The DW-3.4 / 23-28 Hydrogen Compressor, manufactured by Bengbu United Compressor (a leading China-based manufacturer), is engineered to meet the demanding needs of hydrogen processing, storage, and utilization. Designed as a D-type (symmetrical balanced), water-cooled, oil-free lubricated reciprocating piston compressor, it features 2-row, 3-stage compression and modular supply, ensuring seamless integration into various industrial setups.
This high-performance compressor handles a medium composition of 99% hydrogen with trace fatty acids, making it ideal for pure hydrogen applications. Key operational parameters include a processing capacity of 65.3Nm³/min, inlet pressure of 2.3MPa.G, inlet temperature of 70℃, and discharge pressure of 2.8MPa.G, powered by a 75kW main motor. With overall dimensions of approximately 3200 × 3000 × 1850 mm and a weight of ~5.8T, it balances robust performance with manageable installation requirements.
Widely applied in hydrogen power generation, energy storage, heating systems, and fuel cell vehicles, this compressor plays a critical role in compressing hydrogen to high pressures for fuel cell operations, storing it in high-pressure cylinders or underground tanks, and enabling efficient hydrogen delivery in heating systems. Its adaptability also extends to custom scenarios, supporting industries from renewable energy to transportation.
The DW-3.4 / 23-28 Hydrogen Compressor boasts high automation levels and exceptional reliability, minimizing downtime in continuous operations. Its oil-free lubrication design ensures the compressed hydrogen remains uncontaminated, a critical feature for applications requiring high purity, such as fuel cells. The crankcase, crafted from gray cast iron, integrates lubricant storage and multiple functional ports (oil drain, temperature measurement), enhancing operational stability.
Equipped with fewer vulnerable parts, the compressor reduces maintenance frequency and costs. Its low vibration and noise levels create a safer, more comfortable working environment. The main and auxiliary components are mounted on a skid, simplifying transportation and on-site installation—an advantage for projects with tight timelines or remote locations.
Featuring a double intermediate body structure, the compressor prevents oil from migrating from the crankcase to the cylinder, safeguarding medium purity. Cylinders and cylinder heads, made from gray cast iron or forged steel, adopt axial valve arrangement for efficient gas flow. This design, combined with patents such as the piston rod thread protective sleeve (ZL 2017 2 1907021.7) and integrated long-short double compartment (ZL 2018 2 0294762.0), underscores its innovative engineering.
Beyond standard specifications, the compressor offers tailored solutions based on client needs, including flow rate, purity, pressure, operating environment, and specific use cases. It supports various structural forms (D-type, M-type, S-type, etc.), cooling methods (water-cooled, air-cooled, mixed cooling), and installation types (fixed, mobile, skid-mounted, cabin-type), ensuring compatibility with diverse industrial requirements.
Highlight Advantages
| | | |
| Has high efficiency, strong reliability, and high degree of automation; | Less vulnerable parts, low vibration, low noise, and easy operation and maintenance | The main and auxiliary equipment of the compressor are all installed on the sled, running smoothly and reliably. The overall sled installation is convenient for the transportation and installation of the compressor | The entire machine components are carefully designed |
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 |
Whole Machine Description
The compressor adopts D-type (symmetrical balance type), water-cooled, oil-free lubrication, reciprocating piston type, 2-row 3-stage compression, and the entire unit is supplied in a modular manner.
The compressor crankcase is made of gray cast iron and has four holes of different diameters for installing crosshead slides, bearings, and bearing seats. The lower part of the crankcase can store lubricating oil for the compressor to lubricate; The upper surface of the crankcase has an interface for installing a fuel inlet (breathing port) cover plate; In addition, the crankcase also has spare interfaces such as oil drain port, oil gauge observation port, bearing seat oil injection port, and installation oil temperature measurement port. The oil drain port of the crankcase has been connected to the outside of the compartment and is equipped with a manual ball valve for oil discharge from the crankcase.
The middle body of the compressor is a double middle body structure, ensuring that the middle body space is greater than one stroke, preventing compressor oil from entering the cylinder from the crankcase, thus ensuring that compressor oil does not contaminate the medium. The material of the compressor cylinder is gray cast iron/forged steel, and it adopts an oil-free lubrication design, which does not require oil lubrication. The cylinder head material is gray cast iron/forged steel, and the air valves are arranged axially on the cylinder head.
| |
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:
| | |
| Metal cabin | Wooden box | Soundproof cabin |
Technical Parameter
| No. | Model | Medium | Flow rate (Nm3/h) | Exhaust pressure (MPa.G) | Motor power (kW) | Cooling method | Overall dimensions (mm) | Weights (kg) | |
| 1 | DW-1.6/(8～12)-120 | Hydrogen | 800 | 12 | 160 | Water-cooled | 5800×3000×2300 | 8500 | |
| 2 | DW-1.8/15-30 | Hydrogen | 1500 | 3.0 | 75 | Water-cooled | 3200×3000×1850 | 5800 | |
| 3 | DW-6.74(3.3)/0.7(5～12)-12 | Hydrogen | 600 | 1.2 | 90 | Water-cooled | 5000×3200×2100 | 8000 | |
| 4 | DW-17.9/(4～5)-6.5 | Hydrogen | 1270 | 0.65 | 132 | Water-cooled | 3500×3000×2300 | 8000 | |
| 5 | DW-1.8/15-30 | Hydrogen | 1500 | 3.0 | 75 | Water-cooled | 3200×3000×1850 | 5800 | |
| 6 | DW-9.55/0.03-16 | Hydrogen | 515 | 1.6 | 90 | Water-cooled | 3500×3200×2500 | 6500 | |
| 7 | DW-96.5/（ 15～23 ）-（ 21~29） | Hydrogen | 4500 | 2. 1～2.9 | 185 | Water-cooled | 5000×3000×2500 | 12000 | |
| 8 | DW-48/（ 15～23 ）-（ 21~29） | Hydrogen | 2642～4500 | 2. 1～2.9 | 55 | Water-cooled | 4000×2700×2300 | 6000 | |
| 9 | D-0.57/16-200 | Hydrogen | 500 | 20 | 75 | Water-cooled | 5800×3200×2350 | 9000 | |
| 10 | ZW-0. 18/15-22 | Hydrogen | 150 | 2.2 | 11 | Water-cooled | 2200×1600×1700 | 2000 | |
| 11 | ZW-0.82/(6～8)-20 | Hydrogen | 300 | 2.0 | 22 | Water-cooled | 2500×1500×1750 | 2000 | |
| 12 | W-3/0.1-150 | Hydrogen | 212 | 15 | 55 | Water-cooled | 6000×2700×2100 | 15000 | |
| 13 | MW-7.7/9.8-40 | Hydrogen | 4200 | 4.0 | 355 | Water-cooled | 7500×3600×2000 | 22000 | |
| 14 | MW-25.2/（1.5～1.7）-10 | Hydrogen | 3300 | 1.0 | 315 | Water-cooled | 8000×3000×2200 | 20000 | |
| 15 | PW-0.6/(10～15)-30 | Hydrogen | 0~560 | 3.0 | 30 | Mixed cooling | 2200×1800×1600 | 1800 | |
| 16 | PW-13.7/17-25 | Hydrogen | 820 | 2.5 | 30 | Mixed cooling | 4000×2700×2300 | 6000 | |
| 17 | D-0.26/（28～31）-150 | Hydrogen | 400 | 15 | 45 | Mixed cooling | 3800×3200×1950 | 4800 | |
| 18 | PW-13.7/17-25 | Hydrogen | 820 | 2.5 | 30 | Mixed cooling | 4000×2700×2300 | 6000 | |
| 19 | VW-14.3/7 | Hydrogen | 750 | 0.7 | 110 | Mixed cooling | 4800×2250×2100 | 8000 | |
| 20 | DW-7.6/（4～5.7）-6.5 | Hydrogen | 2000 | 0.65 | 55 | Mixed cooling | 3500×3000×2300 | 6000 | |
Project Case
| | |
| Procurement of Molecular Sieve Dehydration, Ethylene Glycol Regeneration and Injection Device, and Fuel Gas Skid in Akimom Gas Field | Zaozhuang CNG compressor project of Chengdu Shenliang Technology Co., Ltd. | Ningxia Zhongneng new materials engineering |
This compressor is widely used in hydrogen power generation (compressing hydrogen for fuel cell electricity production), energy storage (high-pressure hydrogen storage for grid stabilization), heating systems (delivering hydrogen at required pressures), and fuel cell vehicles (supplying compressed hydrogen to on-board fuel cells). It also serves renewable energy projects and industrial hydrogen processing lines.
Oil-free lubrication ensures no compressor oil contaminates the hydrogen medium, which is vital for maintaining 99%+ hydrogen purity—a strict requirement in fuel cells, semiconductor manufacturing, and other high-purity applications. This design eliminates the need for oil separation systems, reducing operational complexity and costs.
Yes. Bengbu United Compressor provides end-to-end customization, from design to production, based on client requirements such as flow rate (up to 4500Nm³/h for related models), pressure (ranging from 0.65MPa to 20MPa), operating temperature, and environmental conditions. Options include different cooling methods, structural forms, and packaging (metal cabins, soundproof cabins) to fit unique project needs.
