There are balance chambers at the second and third levels, and they are connected to the first level. The most direct benefit of such a design lies in that: both the second and third levels have back pressure, which reduces the absolute working pressure of the second and third levels, especially the service life of the third-level ring is significant lyimproved. At the same time, the high-pressure third-level packing is omitted, and the problem that the high-pressure packing is prone to damage is eradicated, and there is no such vulnerable part.

The first level is designed as a vertical free fall, The advantage lies in that the heaviest first-level piston assembly completely has no problem of side wear, and the service life of the first-level piston ring exceeds 12,000 hours; because the downward stroke is a free fall, the power consumption of half of the piston stroke is reduced, and the first-level power consumption accounts for 58-62% of the total power consumption, making the specific power of the L-type oil-free compressor in a leading position.

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