Two Stage Variable Speed (PM VSD)

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Two Stage Low Pressure Permanent Magnetic Variable Speed Screw Air Compressor (PM VSD)

Model:DHLV-Z Series; Brand: Dream

Rated Power: 55~280KW

Air Capacity: 4.25~74.81m³/min

Working Pressure: 0.4~0.5MPa

Product Features

■ Durable air end: efficient and stable;

■ Permanent magnet motor, save your electricity costs, 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 unit noise and provide a quieter environment

■ Independent air intake to make the cooling effect better;

■ Special low-pressure cooler with high efficiency and low noise centrifugal fan, large cooling air flow, low noise, faster cooling effect, convenient cleaning and maintenance;

■ Low-pressure special cyclone inner and outer oil sub-barrel design, improve the initial separation efficiency, with special low-pressure oil sub-core, low pressure loss, better separation effect, lower air oil content, long service life;

■ The conventional maintenance parts (three filters) adopt openable door panels, the installation position is easy to replace, and the maintenance is more convenient

■ Auxiliary oil supply system is added to the unit below 3bar to ensure that the unit (especially the bearing) can get sufficient oil supply in the later period of long-term operation, the unit operates more stable and has a longer life

■ High temperature shutdown protection;

■ Motor overload protection;

■ Overpressure safety decompression system;

■ Optimized shock absorption pad to reduce vibration and noise;

■ Place electrical components and oil separation and filtration modules that are easily damaged by high temperature in the cold room, which improves the service life of the unit.

■ Two-way pressure, one-way temperature control, more protection for series operation.

■ Standard IoT system, so that you can see the operation of your machine on your mobile phone;

Low-voltage two stage air end

Low-voltage two stage air end

1. Low voltage + two-stage design, ultimate energy saving. The unique intercooler spray curtain design reduces the temperature of the air, close to isothermal compression, saving compression power consumption.

2. Single-stage compression ratio is smaller, leakage is less, bearing load is light, and bearing life is greatly improved;

3. The design idea of "large rotor, large bearing, low speed" is adopted to reduce noise and vibration, and increase the life and stability of the air end.

4. The tooth surface is processed by German KAPP rotor grinder to create a high-precision rotor, which is the first guarantee of high efficiency and stability of the air end.

5. Adopt a new type of 5: 6 asymmetric rotor tooth shape, high-precision three-coordinate measuring machine for comprehensive measurement, increase the exhaust volume by 5%.

6. All imported bearings are used.

Permanent magnetic synchronous motor

Permanent magnetic synchronous motor

1. IP54 protection level, more stable and reliable than IP23 in harsh environments.

2. Low temperature rising design, the motor temperature rising is less than 60K, the efficiency is higher, and the service life of the motor is extended.

3. Use ceramic plated bearings to completely eliminate the effect of shaft current on bearings.

4. Manufactured with rare earth permanent magnet materials, the torque during starting and running is large, and the current during starting and running is small.

5. Reasonable magnetic field design, magnetic density distribution, wider operating frequency range of energy-saving motors, and low operating noise.

6. Cooperate with the operation of the inverter to realize the soft start of the frequency conversion, avoiding the strong mechanical impact of the machine equipment when the motor is started at full pressure, which is beneficial to protect the machine equipment, reduce equipment maintenance, and improve the reliability of the equipment.

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. Large-size color LCD touch screen, with a good man-machine communication interface, touch screen with anti-mistouch and sleep function.

2. Customized vector frequency converter, perfectly matched with the motor, low frequency and large torque, can output 180% of rated torque.

3. Develop special programs for low-voltage characteristics, fully monitor the various parameters of the machine, automatically control the state of the machine, no need for special care.

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.

Three filters

Three filters

Air filter: the filter area exceeds 150% of the normal requirement, low the inlet pressure loss , and high energy efficiency.

Oil filter: The design of the imported oil filter with enlarged glass fiber material is adopted. The rated processing capacity of the oil filter is ≥1.3 times of the circulating oil volume. The filtering accuracy is high and the durability is good.

Oil separator: imported glass fiber material oil core, good filtration effect, low oil core pressure loss.

Intake valve

Intake valve

Intake valve: low-pressure dedicated normally closed disc valve, stable operation, high control accuracy of air volume, built-in noise reduction design, low cavitation noise and long service life.

Minimum pressure maintenance valve: a low-pressure special valve with precise opening pressure to ensure stable pressure in the barrel, ultra-fast repositioning, strong sealing, no gas return, low pressure loss and high efficiency

Temperature control valve: Mixed flow temperature control valve: The unit is equipped with a mixed flow temperature control valve to ensure that the unit is more convenient to start in a low temperature environment, and to ensure the unit is in the best performance state by controlling the oil supply temperature of the air end.


DHLV-Z Two-Stage Low-Pressure Permanent Magnetic Variable Speed Screw Air Compressor (PM VSD)

DHLV-Z SeriesWorking pressureCapacityPowerNoiseAir outlet pipe diameterNet weightDimensions(mm)Energy Saving Type
DHLV-55Z4.0-5.058-734.3-14.5152-512557565±3DN6535002160135017501485Energy Saving Type
DHLV-75Z4.0-5.058-735.8-19.5205-6897510068±3DN6537502420153017201485Energy Saving Type
DHLV-90Z4.0-5.058-737.2-24.2254-8559012070±3DN8038003100183020001485Energy Saving Type
DHLV-110Z4.0-5.058-738.2-27.5290-97111015072±3DN8042003100183020001485Energy Saving Type
DHLV-132Z4.0-5.058-7310.2-34.5360-121813217574±3DN12541003500215022501485Energy Saving Type
DHLV-160Z4.0-5.058-7312.6-42.2445-149016021575±3DN12559003500215022501485Energy Saving Type
DHLV-200Z4.0-5.058-7315.7-52.5554-185420027076±3DN15078004100228025501485Energy Saving Type
DHLV-220Z4.0-5.058-7317.3-58.0611-204822030078±3DN15080004100228025501485Energy Saving Type
DHLV-250Z4.0-5.058-7318.8-63.1664-222825035078±3DN15081004100228025501485Energy Efficiency
DHLV-280Z4.0-5.058-7322.3-74.8788-264228037580±3DN15085004200235026501485Energy Saving Type




  • 1. Is there a low-pressure oil-free machine?


    We have a low-pressure dry oil-free screw compressor

  • 2. Exhaust parameters measured data


    Product parameters and configuration and other sales information, please consult our sales manager

  • 3. How big can be the smallest?



  • 4. What are the specifications of the product accessories?


    Please consult our sales manager for sales materials such as product parameters and configurations

  • 5. Is there a configuration table?


    Please consult our sales manager for sales materials such as product parameters and configurations

  • 6. Is there bipolar compression for low pressure?


    DHLV-Z series is a low-pressure two-stage compression micro-oil screw compressor product for Dream

  • 7. What is the difference between energy-saving models and ordinary models?


    Please consult our sales manager for sales materials such as product parameters and configurations

  • 8. Can you provide measured data?


    Please consult our sales manager for sales materials such as product parameters and configurations

  • 9. Can the pressure collection point of the variable frequency control system be pulled to a place about 200 meters away from the machine (the distance between the air compressor room and the air end is about 200 meters


    Please consult our sales manager for sales materials such as product parameters and configurations

  • 10. What is the specific power?


    Please consult our sales manager for sales materials such as product parameters and configurations

  • 11. Measured data of output power and gas production.


    Please consult our sales manager for sales materials such as product parameters and configurations

  • 12. Can the parameters of the machine stand the test?


    All Dream products comply with international standards

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.: +86-15800579721


WhatsApp: +86-15800579721

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

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