What are the correct oil change steps of screw air compressor?

Generally, when the air compressor runs for 2000 hours, the lubricating oil of the air compressor needs to be replaced. The correct oil change procedure is as follows:
1. Run the air compressor to raise the oil temperature for discharge, and then press the stop button to stop the operation;
2. When the blowdown valve is opened, the oil will drain quickly when there is pressure, and the oil will be easy to spray out. At this time, it should be opened slowly to avoid splashing of lubricating oil.
3. After the lubricating oil is drained, close the blowdown valve, open the filler cap and inject new oil; At this time, pay attention to the leakage of all lubricating oil in the system, such as pipelines, coolers, oil and gas barrels, etc.
4. Add new air compressor lubricating oil of the same brand.