22kw (30HP) Ce Approval Water Lubricated VFD Type Oil-Free Screw Air Compressor

  • 1 - 1 Units
  • >=2 Units
Model Number:
Lead Time:
Quantity(Units) 1 - 1 >1
Est. Time(days) 30 Negotiable
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Quick Details
Applicable Industries:
Garment Shops, Manufacturing Plant, Machinery Repair Shops, Food & Beverage Factory, Farms, Restaurant, Home Use, Retail, Food Shop, Printing Shops, Construction works , Energy & Mining, Food & Beverage Shops
Power Source:
Lubrication Style:
Place of Origin:
Shanghai, China
Brand Name:
220v/60hz 380v/50hz, 220v/380v/415v
1050kg, 5200kg
1 Year
After-sales Service Provided:
Field maintenance and repair service
Product name:
oil free screw compressor
Cooling method:
Water Cooling
Motor power:
Supply Ability
Supply Ability:
800 Unit/Units per Month
Packaging & Delivery
Packaging Details
Plywood case: it's standard export package of screw air compressors, we will fix compressor onto plywood pallet first, to protect screw air compressors from shaking broken; after that we will pack the compressors by pp film first, this to protect compressor surface from scratch.
Picture Example:
Lead Time :
Quantity(Units) 1 - 1 >1
Est. Time(days) 30 To be negotiated

TUV certificate 0 oil content Oil Free Screw Compressors 35bar 40bar oil free screw compressor supplier

100% oil free ISO 8573-1:2010 Class 0 certified


250kw/350hp oil free screw air compressor short specification:

  • Model No.: RMW-350A
  • Way of transmission: coupling driven
  • Air flow capaicty: 41m3/min @8bar;  38m3/min @10bar
  • Power: 250kw/350hp
  • Lubrication water volume: 300liters
  • Cooling method: water cooling
  • Speed: 2970rpm
  • Outlet connect: DN100
  • Inlet temperature: atmospheric pressure 2-40℃
  • Outlet temperature: Cooling water temp.+14℃
  • Voltage: 380v/415v/220v-3p-50hz/60hz are available
  • Weight: 5200kg
  • Dimension: 332*160*184cm

Controller features of this oil free screw air compressor

  • 6” touch screen control panel, user interface for simple and convenient operation.
  • multiple link control available, no link panel required, meeting various demand from customers.
  • power saving/local / remote/auto/manual multiple operating modes.
  • real time alarm and warning display for full control of various conditions.
  • actively power saving and protect design for efficiency power saving and loading control.
  • control system functions.
  • 1.Status display
  • 2.Alarm function
  • 3.System time parameters
  • 4.System maintenance
  • 5.Shutdown protection

Oil-Free System Structure of the water lubrication screw air compressor

  • In conjunction with the wear-resistant flat bearing, high performance ceramic bearings constitute a big air chamber between the mechanical bearing seal and the bearing to keep the compression chamber clean, and avoid the influence of compression chamber water & air and vacuum pressure on the bearing. This increases reliability.



High efficiency lubrication water of the oil free screw air compressor

  • Lubricant water functions
  • Serves as sealant, coolant and lubricant.
  • Sealing function reduces/seals “blow hole” between rotors and housing to absolute minimum, ensuring efficient compression with delivered air volume per horse power increased by 15% as compared to general dry-type screw units.
  • Lubricant water also very effectively absorbs and dissipates heat generated during compression process.


High reliability of the oil free air compressor

  • Oil free screw compressor applies rotary single screw air-end.
  • By being in market every since 1982, it has undergone practical for over 30 years, all of it’s air quality, power saving and high reliability features have turned out to be state of the art in design and performance.
  • Air and water are becoming a major trend in compressor market due to their high compatibility, availability, reliability and environment friendliness.


Long interval maintenance periods of the oil free screw air compressor

  • Nearly ideal isothermal compression, direct driven method, smart configuration and precision component design and machining, long bearing service life, all of the above essentially extends interval between regular periodical maintenance.

Near isothermal compression:

  • Thermal energy and water film, arising from the compressed air cooled by the lubricant water that has being injected into the compression chamber, seals up rotor gaps to prevent air back flow. The ideal isothermal compression thus achieves optimum efficiency. Theoretically, when air at 20℃ is compressed to 7kg/cm2G in a thermal isolation process, the discharge air temperature will be over 250℃, injection of lubrication water that has a cooling effect, into the compression chamber will bring the temperature down to about 40℃, achieving high efficiency ideal isothermal compression.


Full range technical parameters of the oil free screw air compressor

ModelWay of TransmissionAir flow /PressurePowerInject water volumeCooling water volumeWay of CoolingSpeedConnectWeightDiemention (mm)
m3/min/barKWHPL/minL/min rpminchKgLWH
RMW-10ACoupling1.16/81.04/107.51027 Air2930G1"50011008001000
RMW-15ACoupling1.56/81.36/10111527 Air2930G1"50011008001000
RMW-20ACoupling2.4/82.12/10152027 Air2930G1"55011309001040
RMW-25ACoupling3.1/82.62/1018.52527 Air2940G1"600140010001200
RMW-30ACoupling3.5/83.13/10223027 Air2940G1"655140010001200
RMW-40ACoupling5.0/84.2/10304040 Air2940G11/2"1150192011701320
RMW-50ACoupling6.1/85.22/10375040 Air2940G11/2"1200192011701320
RMW-60ACoupling7.3/86.13/10456040 Air2960G2"1320192011701320
RMW-215ACoupling25.5/824.0/10160215  Water DN1004500286015001750
RMW-250ACoupling28.0/825.0/10185250  Water DN1004500286015001750
RMW-270ACoupling33.0/827.0/10200270  Water DN1004500286015001750
RMW-350ACoupling41.0/838.0/10250350  Water DN1005200332016001840

We start oil free screw air compressor from design and produce oil free screw air end to complete the oil free compressed air system.

Danfoss solenoid valve, temperature sensor and water coolers for our 40bar oil free screw air compressors:


Air cooling oil free screw air compressor flow chart:


Water cooling screw air compressor flow chart:



Water lubrication oil free screw air compressor photos:



Applications of the oil free screw air compressor

  • For painting: 
  • Air request:oil free, dew point-23℃ (need oil free screw air compressor)
  • After equipment:Adsorption air dryer,Line filter
  • Application:Auto industry,electronic industry
  • For food industry
  • Air request:oil free air,dew point -40℃
  • After equipment:adsorption air dryer, line filter
  • Application:food industry,medicine indust,electronic industry
  • For fermentation
  • Air request: 100% oil free
  • After equipment: line filter, active carbon filter
  • Application:Medicine, Food
  • For cleaning use
  • Air request: 100% oil free, dew point -40℃
  • After equipment:adsorption air dryer, line filter
  • Application:Electronic industry, laboratory
  • For PET, Transport use
  • Air request:Oil free,dew point 2℃
  • After equipment:Refrigerant air dryer, line filter
  • Application:Cement,fabric, food,medicine
  • For instrumentation control use
  • Air request:oil free air,dew point -40℃
  • After equipment:adsorption air dryer, line filter
  • Application:Petroleum ,Electronic,Auto,Medicine,Electricity
  • For medical industry
  • Air request:Oil free, dew point -40 ℃
  • After equipment:adsorption air dryer, line filter




 Our company offer technical support before and after sales,  products training as well. we are professional for screw air compressors, all air compressor outlet drawings, install instruction drawings, technical parameters, compressor configuration list are available; all compressor trouble shooting documents are available, besides our after sales team will give support at any time.


For more about our screw air compressors, welcome to contact with us!