40bar high pressure oil free screw compressor

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

Danfoss solenoid valve for our 40bar oil free screw air compressors:

Danfoss water cooler for our 40bar oil free screw air compressors

Stainless steel intak valve and min. pressure valve for our 40bar oil free screw air compressors:

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!

Shanghai Royal Machinery Co.,Ltd is a professional company of industrial air compressors, air treatment and air compressor spare parts, with engineers and sales people who have over 8 years experience, Royal Machinery has two business divisions, one is our own brand products, the other brands are Ingersoll Rand and Compair products. We have been marketing industrial compressed air equipment to global market since 2017 and the main assembling plants cover more than 50,000 square meters and 320 employees.

The range of our compressors supplying start from the smallest compressors used by individuals to very large compressors used in heavy industrial applications. We started the business as a close partner to our customers, our sales team can provide you competitive price with high quality products, with our customers supporting, our team will get all the orders fulfilled on time and provide you excellent after-sales service. Our product range represents the most comprehensive portfolio of compressed air equipment offered for thousands of applications in the Oil, Textile, Food, Marine, Mining and many other industries. Our products consist of medium and high pressure reciprocating compressors, oil-injected screw compressors, oil free screw compressors, vane compressors, centrifugal compressors, portable compressors, CNG compressors and CNG related equipment, also high pressure scuba air compressors.

Our mission is to bring China assembled compressors of good quality and service, with attractive price for all the customers all over the world. You are welcomed to be developed with us together for a fruitful future.