Dry Oil Free (7-10 Bar)

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Dry Oil Free Fxed Speed Screw Air Compressor

Model: DMW-G Series; Brand: Dream

Rated Power: 45~250KW

Air Capacity: 6.9~46m³/min

Working Pressure: 0.7~1.0MPa

Product Features

■ Industry-leading air end, imported brand, quality assurance.

■ IE3 motor, save your electricity cost, IP54, B-level temperature rise is suitable for harsh environments such as large dust and high temperature;

■ Coupling connection, more energy saving;

■ Multiple noise reduction design, calculated according to noise theory, with special flame retardant muffler cotton inside, to reduce the noise of the unit and provide a quieter environment for use.

■ Independent air inlet, reduce intake resistance, multi-function intake valve group, start without load, motor load is small. Use high-efficiency filters to effectively filter particulates in the air;

■ Centrifugal fan with plate-fin cooler has high wind pressure, low noise, external independent suction, exhaust air upward through a specially designed air duct to prevent hot air from returning; cooler modular design, vertical installation, effectively eliminate thermal stress , More stable operation and long service life;

■ Optimized shock absorption pad to reduce vibration and noise;

■ Routine maintenance parts adopt openable door panels, the installation position is easy to replace, and maintenance is more convenient

■ Motor overload protection

■ The pipeline system is designed according to the design pressure, and the reasonable pipeline is selected, the pipeline pressure loss is low, and the energy efficiency of the unit is improved

■ All 304 stainless steel pipes are used, even under high temperature and high humidity conditions, it will not rust and corrode, and the service life is longer

■ Separate design for cold and hot zone, no heat zone inside the unit, electrical components are in low temperature zone, longer service life

■ Dedicated control system, multi-channel pressure sensor and multi-channel temperature sensor to comprehensively detect the running state of the unit; the user interface is more friendly, the control is more accurate and reliable.

■ The unit is equipped with an Internet of Things system, which can monitor the machine status on the mobile phone.

Dry type two stage air end

Dry type two stage air end

1. The air compression chamber is completely separated from the oil chamber. The air side adopts a stainless steel spring-loaded metal ring wear-free sealing system. The lubricating oil side is a wear-free sealing system with a copper labyrinth seal. The two do not contact.

2. The secondary rotor is made of stainless steel, which is corrosion resistant and more reliable;

3. The rotor and the inner wall of the compression chamber of the air end are coated with a strong super coating to prevent corrosion and the coating from falling off, and the life of the air end is longer.

4. The first-stage casing of the air end is directly cooled by wind, and the lubricated oil of the second-stage main engine is cooled by filtered lubricating oil, which avoids the generation of scale and improves the reliability of operation.

Specialized  motor for air compressor

Specialized motor for air compressor

1. Imported brand bearings, protection class IP54, insulation class F, suitable for harsh environments such as large dust and high temperature.

2. IE3 high-efficiency motor uses less electricity and reduces your cost of use.

3. The motor has a large margin design and a large starting torque, which can meet the requirements of full life use under various working conditions.

High-quality and efficient coupling

High-quality and efficient coupling

1. The coupling is a torsionally elastic coupling with failure protection function, which can effectively damp and reduce the vibration and shock generated during the operation. 

2. The elastic body is only under pressure and can withstand greater loads. The drum-shaped teeth of the elastic body can avoid stress concentration.

Advanced and reliable electronic control system

Advanced and reliable electronic control system

1. Intelligent control system, with a good human-machine communication interface; high-quality electrical components are selected, and contactors are imported brands.

2. Special program, with multi-channel pressure sensor and multi-channel temperature sensor, comprehensive detection of the running state of the unit, automatic control of the machine state, no need for special care

3. Emergency stop function, there is a push-type emergency stop switch in a prominent position of the unit, which can be immediately stopped in an emergency.

4. Configure Internet of Things, you can check the running status of the unit on your mobile phone

5. Independent air duct design, applicable to various working conditions.

Silent centrifugal fan

Silent centrifugal fan

1. The whole series adopts centrifugal fan, which is more efficient and more energy-saving.

2. Compared with axial fans, centrifugal fans have higher air pressure, lower noise and more energy saving.

3. Controlled by frequency conversion fan, the oil temperature is constant and the service life of lubricating oil is greatly extended.

4. Due to the high wind pressure, the cooler and filter are less likely to be blocked.

Air filter

Air filter

Air filter: the filter area exceeds 150% of the normal need, the inlet pressure loss is low, and the energy efficiency is good;

Oil filter: A full-flow built-in pressure-retaining oil filter suitable for medium-pressure working conditions. The rated processing capacity of the oil filter is ≥ 1.5 times the circulating oil volume. The imported filter material and large excess design are used. The filter has high filtration accuracy and good durability.

Oil recovery filter element: high-quality filter material is selected, with high filtration accuracy and sufficient oil recovery.

Inlet valve

Inlet valve

Inlet valve: The hydraulically controlled normally closed disc valve is used. The hydraulic control is accurate and reliable, and automatic loading and unloading control can be achieved through the piston.

Temperature control valve (part): The unit is equipped with a temperature control valve to ensure that the unit is more convenient to start in a low temperature environment, and to ensure the oil supply of the bearing at any time; to ensure the stable operation of the unit.

Overflow valve: Direct-acting overflow valve with reliable structure; when the oil pressure exceeds the set value, direct the oil into the oil storage tank to ensure the stable supply pressure.


DMW-G Dry oil free series

DMW-G seriesWorking pressureCapacityPowerNoiseAir outlet pipe diameterNet weight(kg)Dimensions(mm)

























  • 1. Requirements for using lubricating water (after-sales service)


    Pure water must be used to ensure that the water is pure.

  • 2. How to add lubricating water?


    When the water inlet of the equipment is connected to the water pipe, the equipment will automatically replenish water if there is a certain water pressure.

  • 3. Do I need to change the lubricant during maintenance?


    Water lubrication equipment does not need to add lubricating oil, it is lubricating water instead of lubricating oil

  • 4. Does the equipment have an oil separation core?


    Water lubrication equipment does not require an oil separation core.

  • 5. How to add water to replenish water?


    Automatically control water replenishment

  • 6. What to do if there is water shortage?


    The equipment will automatically add lubricating water according to the water level

  • 7. What are the maintenance supplies?


    Air filter, water filter

  • 8. Is it guaranteed to be oil-free? (Sales)


    Dream’s oil-free units have been certified by Guotong Rheinland and have a Class0 certificate

  • 9. Can tap water be used?


    The water requirement for water-lubricated oil-free units is soft water. For specific water quality requirements, see the manual

  • 10. Will it rust?


    All materials in contact with water are made of stainless steel and will not rust

  • 11. Can it be made of stainless steel?


    All materials in contact with water are stainless steel

  • 12. What material is the casing of the air compressor?


    Cold rolled steel sheet

  • 13. Can the water tank be omitted?


    The unit needs to automatically replenish and drain water according to the status, and need to be equipped with a water tank

  • 14. Is the air coming out with a lot of water?


    The exhaust temperature of the unit is about 50℃, and the gas needs to be dried by post-processing equipment

  • 15. Can the tap water be directly connected?


    The water requirement for water-lubricated oil-free units is soft water. For specific water quality requirements, see the manual

  • 16. What should I do if it freezes outdoors in winter?


    The screw air compressor is required to be placed in the air compressor room. Please follow the instructions for long-term downtime

  • 17. If the air compressor is placed outdoors, how to avoid freezing in winter?


    The screw air compressor is required to be placed in the air compressor room. Please follow the instructions for long-term downtime

  • 18. Motor cooling method


    Air-cooled motor

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For more than a decade, Dream (Shanghai) Compressor Co., Ltd has been striving to become one of the leading manufacturers of compressed air solutions in China.

Contact Us

Mob.: +86 134 8216 1490

E-mail: sales@dmcomp.com

Skype: +86 134 8216 1490

WhatsApp: +86 134 8216 1490

Add.: No.30 Caoli Road, Jinshan District, 201502 Shanghai, China

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