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Frequently Asked Questions

How Can We Help?

  • 1. How often to replace the belt (after-sales service)

    A: 

    Replace every 3000H when running under normal environment

  • 2. Is the belt drive dangerous?

    A: 

    Every machine manufactured by Dream is passed a strict test process and then leaves the factory. The door is not allowed to be opened during the operation of the equipment.

  • 3. Routine maintenance to replace those materials

    A: 

    Air filter, oil filter, oil separator, lubricating oil, motor grease, and belt are routine maintenance parts of air compressors and need to be replaced on time; the dust on the filter needs to be cleaned regularly during use.

  • 4. Brand (sales) of main engine, motor and other components

    A: 

    The main engine is Dream's customized oil-injected lubricated twin-screw high-efficiency main engine, and the motor is a high-efficiency motor with secondary energy efficiency.

  • 5. Whether the belt is easy to break

    A: 

    The belts of all models are checked strictly according to the belt power.

  • 6. Specific description of noise, please watch video, etc. Description of unit noise

    A: 

    Our model is a box-type structure, and there are silencer components on the inner surface to silence most of the main engine noise inside the unit. All units have strict belt installation steps and requirements to improve belt transmission efficiency and eliminate noise during belt transmission. The operating noise of the unit is low.

  • 7. Maintenance period, price, etc.

    A: 

    Our random user manual provides a detailed description of maintenance parts, maintenance inspection parts, and maintenance cycles. Please consult Dream's sales manager for prices.

  • 8. If the protection level is not high, will the motor be bad?

    A: 

    Our motors are high-efficiency motors with two-level energy efficiency, and the motor protection level is ≥IP54. Each unit is tested and passed a strict test process before being shipped.

  • 9. Can I buy maintenance accessories from the market for replacement?

    A: 

    Please do not use maintenance parts that are not genuine from our company to avoid losing the quality assurance qualification. Non-our genuine maintenance parts may prevent the unit from operating normally.

  • 10. Customers feedback that the belt conveyor is noisy? How to reduce noise?

    A: 

    Our model is a box-type structure, and there are silencer components on the inner surface to silence most of the main engine noise inside the unit. All units have strict belt installation steps and requirements to improve belt transmission efficiency and eliminate noise during belt transmission. The operating noise of the unit is low.

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  • 1. Cases in the industry and region

    A: 

    Please check Dream official website

  • 2. Is the motor an energy efficiency IE4 motor?

    A: 

    The energy efficiency of permanent magnet motors reaches IE4 level.

  • 3. Motor cooling method

    A: 

    Depending on the model, there are air-cooled motors and oil-cooled motors.

  • 4. Is the equipment air-cooled or water-cooled

    A: 

    We can produce both air-cooled and water-cooled models. Please consult our sales manager for specific product information.

  • 5. Whether the air compressor has an explosion-proof certificate (Yibin coal mine customer)

    A: 

    For special models, please consult our sales manager.

  • 6. How big is the centrifugal fan? What’s the air volume? What brand?

    A: 

    Regarding the cooling air volume, please check our model parameter table

  • 7. The customer’s actual pressure is 8 bar. Can an 8 bar machine meet the requirements?

    A: 

    Please refer to the catalog for the rated exhaust pressure of our corresponding models

  • 8. Will it degauss in 3-5 years?

    A: 

    The magnetic steel of the permanent magnet synchronous motor we use is neodymium iron boron permanent magnet material. Can be used for a long time under normal use

  • 9. Is the vibration big? Help me deal with it during installation

    A: 

    The vibration value of the unit is less than the national standard value.

  • 10. What is the range of pressure fluctuations?

    A: 

    The variable frequency unit can realize constant pressure air supply, and the industrial frequency unit can set the loading and unloading pressure according to the requirements

  • 11. Is it possible to achieve constant pressure air supply?

    A: 

    Variable frequency unit can realize constant pressure air supply

  • 12. In order to avoid frequent start and stop, what is the minimum pressure difference between loading and unloading, and what is the best pressure difference to maintain?

    A: 

    Please refer to our manual.

  • 13. How many years can this machine be used?

    A: 

    The design life of our unit is 30 years.

  • 14. Can you work 24 hours a day?

    A: 

    YES

  • 15. Comparison of oil-cooled and air-cooled motors

    A: 

    Oil-cooled motors use lubricating oil for cooling, which has high cooling efficiency and is less affected by ambient temperature. Air-cooled motors use cooling air for cooling.

  • 16. Material and life of permanent magnet motor

    A: 

    The magnetic steel of the permanent magnet synchronous motor we use is neodymium iron boron permanent magnet material. Can be used for a long time under normal use

  • 17. Which one is more stable, the one-body or the split-body laser machine?

    A: 

    As long as the configuration is reasonable and the maintenance is normal, Dream's products can operate stably for a long time.

  • 18. Why is Dream’s offer so expensive

    A: 

    The price of a product includes the quality and service of the product. You need to compare not only the price, but also the quality and service.

  • 19. Is there a nationwide warranty?

    A: 

    We have established branches across the country, covering provinces and cities across the country, and arrive at the scene within hours

  • 20. What is the gas output of the machine

    A: 

    Please check our catalog for parameters such as the displacement of the unit

  • 21. How much are the requirements for the ground load. Can it be placed on the second floor?

    A: 

    Our unit is installed without foundation and only requires a flat and explained ground. We can provide the static load and dynamic load of the unit.

  • 22. Can the mobile phone be controlled remotely?

    A: 

    We have a cloud IoT system, which allows you to view unit operating information on your mobile phone.

  • 23. Are all the manuals and certificates of the air compressor complete?

    A: 

    All models will be shipped with user manuals, relevant pressure vessel certificates, and certificates. Please check the packing list carefully when receiving the goods.

  • 24. Customers feedback that the belt conveyor is noisy? How to reduce noise?

    A: 

    Our model is a box-type structure, and there are silencer components on the inner surface to silence most of the main engine noise inside the unit. All units have strict belt installation steps and requirements to improve belt transmission efficiency and eliminate noise during belt transmission. The operating noise of the unit is low.

  • 25. Can I buy maintenance accessories from the market for replacement?

    A: 

    Please do not use maintenance parts that are not genuine from our company to avoid losing the quality assurance qualification. Non-our genuine maintenance parts may prevent the unit from operating normally.

  • 26. If the protection level is not high, will the motor be bad?

    A: 

    Our motors are high-efficiency motors with two-level energy efficiency, and the motor protection level is ≥IP54. Each unit is tested and passed a strict test process before being shipped.

  • 27. Maintenance period, price, etc.

    A: 

    Our random user manual provides a detailed description of maintenance parts, maintenance inspection parts, and maintenance cycles. Please consult Dream's sales manager for prices.

  • 28. Specific description of noise, please watch video, etc. Description of unit noise

    A: 

    Our model is a box-type structure, and there are silencer components on the inner surface to silence most of the main engine noise inside the unit. All units have strict belt installation steps and requirements to improve belt transmission efficiency and eliminate noise during belt transmission. The operating noise of the unit is low.

  • 29. Whether the belt is easy to break;

    A: 

    The belts of all models are checked strictly according to the belt power.

  • 30. Brand (sales) of main engine, motor and other components

    A: 

    The main engine is Dream's customized oil-injected lubricated twin-screw high-efficiency main engine, and the motor is a high-efficiency motor with secondary energy efficiency.

  • 31. Routine maintenance to replace those materials

    A: 

    Air filter, oil filter, oil separator, lubricating oil, motor grease, and belt are routine maintenance parts of air compressors and need to be replaced on time; the dust on the filter needs to be cleaned regularly during use.

  • 32. Is the belt drive dangerous?

    A: 

    Every machine manufactured by Dream is passed a strict test process and then leaves the factory. The door is not allowed to be opened during the operation of the equipment.

  • 33. How often to replace the belt (after-sales service)

    A: 

    Replace every 3000H when running under normal environment

  • 34. What are the advantages of 25 three-in-one screw compressors

    A: 

    All pipelines have been connected, and customers can install and use them immediately, eliminating the need for on-site installation.

  • 35. Are you single screw or twin screw?

    A: 

    We are micro-oil twin screw air compressors.

  • 36. What is the energy efficiency rating and specific power of your machine?

    A: 

    We test according to the GE19153-2019 standard and leave the factory after passing the test.

  • 37. Why is so much more expensive than the split body?

    A: 

    The all-in-one machine has been equipped with gas storage tanks, filters, and refrigeration dryers, and the unit can be used without installation after it arrives on site.

  • 38. Does the integrated tank machine have a filter, how many?

    A: 

    The conventional integrated machine is equipped with DQ and DP filters, and the pressure dew point of the refrigeration dryer is 2~10 ℃. 16bar all-in-one machine is equipped with four filters: DQ, DP, DS, DA

  • 39. If you don’t add a suction dryer and only add a cold dryer, there will be no more water?

    A: 

    The exhaust pressure dew point of the refrigeration dryer is 2~10 degrees. You can confirm whether the dryer is equipped according to the requirements of use.

  • 40. What is the cutting limit of the full-performance all-in-one machine 16 kg with a laser cutting machine? What is the cutting limit of different materials for a 16 kg full-performance all-in-one machine?

    A: 

    The cutting material and requirements and the laser cutting machine model will all have an impact on the cutting thickness.

  • 41. Full-performance all-in-one machine 16 kg with laser cutting machine Why does the customer feedback that the lens still has water and oil stains?

    A: 

    1. The exhaust oil content of the unit is ≤3ppm, and post-processing equipment is required.
    2. The unit and post-processing equipment need to be maintained on time with our genuine accessories;

  • 42. Can the 16 kg full-performance all-in-one machine be directly used with a laser cutting machine without additional post-processing?

    A: 

    16bar unit is equipped with DP, DQ, DS, DA four-stage filtration and refrigeration dryer as standard.

  • 43. Is the number of head bearings fixed? Is it related to the air end?

    A: 

    The specifications and quantity of bearings used by each model are designed and selected according to the characteristics of the model.

  • 44. What is the difference between the 16 kg head of the full performance all-in-one machine and the conventional 8 kg main machine?

    A: 

    There is a difference, we use a 16bar dedicated high-performance air end for the 16bar unit.

  • 45. Is the oil content high? Will the 16 kg cutting machine leak oil?

    A: 

    The oil content standard of our machine is ≤3PPM. Dream's dedicated laser cutting all-in-one machine is widely used in the laser cutting industry and has received high praise from users.

  • 46. Can I bring a suction dryer?

    A: 

    Yes, please contact our sales manager for specific requirements

  • 47. Dimensions, noise issues

    A: 

    Please refer to our product catalog for the external dimensions and other related parameters of this series of models.

  • 48. Can the volume of the gas storage tank be changed?

    A: 

    The standard model gas tank volume has been finalized, if you have any special requirements, please contact our sales manager.

  • 49. Filter accuracy, pressure dew point

    A: 

    The conventional integrated machine is equipped with DQ and DP filters, and the pressure dew point of the refrigeration dryer is 2~10 ℃. 16bar all-in-one machine is equipped with four filters DQ, DP, DS, DA

  • 50. Comparison with split full set price

    A: 

    Please contact our sales engineer, she will give you an accurate quotation.

  • 51. Advantages with conventional machines

    A: 

    All pipelines have been connected, and customers can install and use them immediately, eliminating the need for on-site installation.

  • 52. Is there an automatic drain?

    A: 

    Our SAT integrated machine has been installed with an electronic automatic drain valve.

  • 53. Does the filter element need to be replaced?

    A: 

    Air filter, oil filter, oil separation core, lubricating oil, motor grease, belt are the routine maintenance parts of air compressors, which need to be replaced on time; the dust on the filter needs to be cleaned regularly during use.

  • 54. Can it be moved?

    A: 

    The standard model is not equipped with wheels, and the universal wheel mounting holes are reserved. Please contact the sales manager for special requirements.

  • 55. Air compressor energy efficiency rating

    A: 

    Dream's DHV-Z series energy-saving silent bipolar compressor unit has an energy efficiency rating of level 1. You can find our company's filing information on the energy efficiency filing website

  • 56. Motor cooling method

    A: 

    The motor of Dream's DHV-Z series energy-saving and silent bipolar compressor unit uses an air-cooled motor

  • 57. Differences between oil-cooled motors and air-cooled motors.

    A: 

    Oil-cooled motors use lubricating oil for cooling, which has high cooling efficiency and is less affected by ambient temperature. Air-cooled motors use cooling air for cooling.

  • 58. Whether the motor is the first energy efficiency IE4 motor is the first energy efficiency IE4 motor

    A: 

    Our permanent magnet motor efficiency value reaches IE4 standard

  • 59. What is the adjustment range of the frequency conversion?

    A: 

    The frequency adjustment range of the permanent magnet frequency conversion unit is 40~100%

  • 60. What is an oil-cooled motor?

    A: 

    Oil-cooled motors use lubricating oil for cooling, which has high cooling efficiency and is less affected by ambient temperature. Air-cooled motors use cooling air for cooling.

  • 61. The failure rate is higher than ordinary, right?

    A: 

    The two-stage compressor unit uses a large-rotor low-speed main engine, with longer bearing life and more stable operation

  • 62. What kind of fan is the fan?

    A: 

    Our DHV-Z series of silent and energy-saving bipolar compressor units use centrifugal fans. The cooling system of the whole machine has been factory tested, and the cooling effect can meet the long-term stable operation at an ambient temperature of 40℃.

  • 63. Will the motor demagnetize?

    A: 

    The magnetic steel of the permanent magnet synchronous motor we use is neodymium iron boron permanent magnet material. Can be used for a long time under normal use

  • 64. Can you see the operation of the air compressor?

    A: 

    Our cloud IoT system supports mobile APP to view the operating status of the unit, and cannot operate the unit

  • 65. Can the air compressor be turned on on the mobile phone?

    A: 

    Our cloud IoT system supports mobile APP to view the operating status of the unit, and cannot operate the unit

  • 66. What are the maintenance supplies?

    A: 

    Air filter, oil filter, oil separator, screw oil, grease

  • 67. How much does the maintenance cost? Is it high?

    A: 

    Depending on the size of the equipment model, maintenance costs vary

  • 68. Is it the same as regular machine debugging? (After sale)

    A: 

    Same, just follow the commissioning manual

  • 69. What air end is used? Is a booster used?

    A: 

    The two-stage compression air end is used, and the air end allocates the compression ratio reasonably through careful design to meet the pressure needs. Different from the usual design method of compressor and supercharger in the market, our company's medium-pressure screw compressor does not use a supercharger, thus avoiding the common problems such as oil leakage of the shaft seal of the supercharger.

  • 70. What is the parameter range of DR(V)-Z medium pressure machine?

    A: 

    The power range of this series of medium presses is 18.5KW-280KW, and the pressure is divided into five levels: 2MPA, 2.5MPA, 3MPA, 3.5MPA, and 4MPA. The pressure segments corresponding to different powers are slightly different, please consult the parameter table or call for details.

  • 71. What are the advantages of Dream medium pressure machine compared with piston machine?

    A: 

    1. Under the same displacement and pressure, the Dream screw press has a smaller size and a smaller footprint.
    2. The screw press is easy to install and use, with low noise, low vibration and high reliability.

    3. The screw intermediate compressor has fewer wearing parts, low maintenance cost and long service life.

  • 72. What is the difference between the medium pressure machine and the normal pressure screw machine?

    A: 

    The Dream DR(V)-Z medium pressure machine is a standardized model. The operation is basically the same as that of the atmospheric screw machine. It does not require personnel on duty and has a complete automatic control system. In use, pay attention to the reasonable matching of gas storage tanks and post-processing equipment, timely maintenance, and use of original accessories.

  • 73. Do I need to add a cold dryer to remove water between the first and second levels? How does the Dream medium compressor solve the problem of condensed water in the system?

    A: 

    There is no need to add a cold dryer to remove water between the first and second stages. Condensed water is generated in the system because the temperature of the compressed air in the compressor is lower than the pressure dew point, and the water vapor in the compressed air condenses into liquid water, which causes the air compressor oil to emulsify and deteriorate, causing other failures. In the design of the Dream medium compressor, the various conditions analyzed by the water are fully considered, and the temperature of the compressed air has been maintained above the dew point temperature, so that the generation of condensed water is fundamentally avoided; compared to the inter-stage cooling and drying The machine method can solve the problem more fundamentally, and the system is more reasonable and there are fewer failures.

  • 74. Can the exported machine provide detailed product information, certificates, and installation instructions in English?

    A: 

    Most of the bottle blowing related information will be placed in the random parts box

  • 75. Is it controlled by PLC?

    A: 

    The control system of the unit is a PLC intelligent controller with man-machine communication interface.

  • 76. Will it explode? With such a high pressure

    A: 

    All the keys, flanges and pressure vessels in the unit are manufactured in accordance with the requirements of the national standard, and there is no such risk

  • 77. What material is the piston made of?

    A: 

    Dream's screw type medium and high pressure micro-oil screw compressor uses a two-stage compression twin-screw main engine to compress gas without pistons.

  • 78. Is there an electric control box?

    A: 

    Dream's screw type medium and high pressure micro-oil screw compressor is an integral box structure, and customers only need to connect to the power supply to use

  • 79. What brand of high pressure solenoid valve is used?

    A: 

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

  • 80. What are the specifications of product accessories?

    A: 

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

  • 81. Is there a configuration table?

    A: 

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

  • 82. How much can the highest pressure do?

    A: 

    40bart

  • 83. How many air ends are there?

    A: 

    Dream's screw type medium and high pressure micro-oil screw compressor is a air end

  • 84. Is the inverter of good quality? Is it high precision?

    A: 

    We have developed a dedicated inverter for air compressors in cooperation with well-known brands in the industry, and there is no problem in quality assurance

  • 85. What material is the cabinet made of?

    A: 

    Cold rolled steel sheet

  • 86. Can the air compressor be operated by mobile phone?

    A: 

    Our cloud IoT system supports mobile APP to view the operating status of the unit, and cannot operate the unit

  • 87. How much ppm is the oil content?

    A: 

    ≤3ppm

  • 88. Service life, is it safe?

    A: 

    The design life of the unit is 30 years, and you must perform normal maintenance as required

  • 89. Air end brand and material

    A: 

    Dream's customized medium and high voltage series air end

  • 90. Price comparison with piston type, technical advantages (sales)

    A: 

    Dream's screw type medium and high pressure micro-oil screw compressor is characterized by high efficiency, quietness, intelligent control, simple maintenance, long-term stable operation, and continuous output of compressed gas. No pulse and little vibration.

  • 91. Can the maintenance time be used for 3000 hours?

    A: 

    Due to the special operating conditions of medium and high pressure, the equipment needs to replace the three filters and oil every 1000/1500 hours

  • 92. Can you use general-purpose screw oil?

    A: 

    The medium and high pressure operating temperature and pressure are very high. The oil used must be the original oil, and the oil number must be special for medium and high pressure.

  • 93. Is the use of consumables the same as atmospheric equipment? (After-sales service)

    A: 

    It is not the same. The medium and high-pressure equipment consumables are customized consumables according to the equipment pressure, and ordinary ones cannot be used.

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

    A: 

    All Dream products comply with international standards

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

    A: 

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

  • 96. What is the specific power?

    A: 

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

  • 97. 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

    A: 

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

  • 98. Can you provide measured data?

    A: 

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

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

    A: 

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

  • 100. Is there bipolar compression for low pressure?

    A: 

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

  • 101. Is there a configuration table?

    A: 

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

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

    A: 

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

  • 103. How big can be the smallest?

    A: 

    22kW

  • 104. Exhaust parameters measured data

    A: 

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

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

    A: 

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

  • 1. Motor cooling method

    A: 

    Air-cooled motor

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

    A: 

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

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

    A: 

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

  • 4. Can the tap water be directly connected?

    A: 

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

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

    A: 

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

  • 6. Can the water tank be omitted?

    A: 

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

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

    A: 

    Cold rolled steel sheet

  • 8. Can it be made of stainless steel?

    A: 

    All materials in contact with water are stainless steel

  • 9. Will it rust?

    A: 

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

  • 10. Can tap water be used?

    A: 

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

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

    A: 

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

  • 12. What are the maintenance supplies?

    A: 

    Air filter, water filter

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

    A: 

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

  • 14. How to add water to replenish water?

    A: 

    Automatically control water replenishment

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

    A: 

    Water lubrication equipment does not require an oil separation core.

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

    A: 

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

  • 17. How to add lubricating water?

    A: 

    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.

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

    A: 

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

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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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