Looking to purchase air compressors

Atlas, Ingersoll Rand, Shouli, Fu Sheng, Eliot............................

Our company uses air compressors from three different brands: Kaishan (fixed-frequency), Deman (variable-frequency), and Atlas (fixed-frequency), all with a capacity of 160 kW. No failures have occurred with regular maintenance according to the scheduled cycle. Let’s talk about the advantages and disadvantages of these: Kaishan has relatively high efficiency, moderate maintenance costs, with maintenance required every 5,000 hours. It’s mostly agent-based maintenance and repair services, and the quality of service isn’t very good (maybe I just didn’t come across a good one) ； Deman air compressors have the lowest maintenance costs, with maintenance required every 3,000 hours; their efficiency is slightly lower. The manufacturer handles maintenance and repairs on its own, with prompt response and high efficiency. With Atlas, the maintenance costs are relatively high (tens of thousands per time, which is a bit difficult to afford), and the moisture content in the compressed air is high. Repair services are available on demand; however, after coming to check the issue, the process of providing a quote and obtaining the necessary parts takes some time. Another point is that the cost of buying a new device is more or less the same. So when purchasing a air compressor, it is still necessary to consider various factors and choose the most suitable one

Could you recommend some high-quality used segments? Thank you