The oil injected into the oil-injected screw air compressor is primarily used to carry away the heat generated during the compression process. The amount of oil injected directly affects the performance of the compressor. Insufficient oil injection can lead to an increase in the outlet air temperature and vibration in the compressor bearings. On the other hand, excessive oil injection can accelerate carbon deposits in the compressor. The control of oil injection relies on the oil supply valve in the lubrication oil circuit, and the valve is typically opened to around 90% of its maximum capacity.