Technical specifications

YJT two-stage screw air compressor (75–560 kW)
Working pressure 0.8-1.0[MPa] 116 - 145 [psig]
Working air flow 20-60[m³/min] 706 - 2119 [cfm]
Rated power 90-330[kW] 121 - 443 [hp]

Product Overview


YJT is a twostage waterlubricated oilfree screw compressor. It adopts series compression with two stainlesssteel rotor airends. Purified water serves as the only medium for lubrication, sealing and cooling, and the discharge air consistently reaches ISO 85731 Class 0 oilfree grade. Staged twostage compression further enhances isothermal benefits. It delivers excellent temperature rise control and much higher volumetric efficiency than singlestage models. Lower energy consumption at the same pressure, suitable for continuous air demand with mediumlarge flow and stable high pressure. The airend chamber and rotors are fully made of stainless steel, corrosionresistant. No risk of air contamination from metal debris or peeling coating. The purewater lubrication design requires no lubricating oil, no oil separator and generates no waste oil. It eliminates costs for oil purchase, oil change and hazardous waste disposal and complies with environmental regulations. Equipped with intelligent touch PLC control system, it monitors pressure, temperature, water level and operating load in real time. Multiple interlock protections are available (over-temperature, over-pressure, water shortage, overload alarm and shutdown). Stable and reliable for 7×24 continuous operation. Shock-absorbing and noise-reducing structure ensures low operating noise, friendly to workshop environment. Compared with conventional dry twostage oilfree compressors, it avoids hightemperature ageing of sealing parts, with longer service intervals and simpler maintenance. Ideal for projects with strict requirements on air purity, supply stability and energy control: sterile pharmaceutical workshops, large food production lines, semiconductor plants, large precision machining facilities and central air supply stations.

  • UNITED OSD’s new-generation rotor profile optimizes sealing and fluid-dynamic losses for outstanding performance.
  • Imported bearings, closely coordinated with FAG, with full consideration of application, configuration, lubrication, and service life for long bearing life.
  • Latest two-point tolerance evaluation, tailored to screw compressor requirements with optimized clearances—excellent performance and high reliability.
  • Precisely calculated oil injection at each stage fully cools the compression process and ensures thorough lubrication of moving parts.


Five Core Advantages

Truly oil‑free, pure water lubrication, isothermal energy saving, low maintenance, low noise & durable. Suitable for food, pharmaceutical, electronics, medical, precision machining and more.
【True Class 0 Oil‑Free】Oil‑free design from the source. No oil separator, no oil mist. Safe for sensitive industries such as food, pharmaceutical and electronics.
【Isothermal Energy Saving】Isothermal compression keeps low airend temperature, improves volumetric efficiency. VSD models deliver outstanding energy savings.
【Low Operation & Maintenance Cost】No costs for lubricant purchase, oil change or waste oil disposal. Only filter replacement and water top‑up, easy servicing.
【Clean & Corrosion‑Resistant】Airend rotors and air passages are stainless steel. Rust‑resistant, no risk of coating peeling contaminating air supply.
【Quiet & Eco‑Friendly】Low‑friction design reduces operating noise. Zero waste oil discharge, compliant with international environmental regulations, convenient for overseas factory acceptance.

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