East about screw air compressor is a few parts of the clearance volume:

1, the piston movement by the end of the exhaust stroke, its end with the end clearance between the cylinder;

2, cylinder lens and live the great circle from the first piston ring end face to the gap between;

3, because the gas cutting to the cylinder volume formed by channel capacity.

Inherent in gas cutting volume, such as cutting channels, spring hole (channel capacity, the largest proportion of the annular clearance with a value effect) compressor clearance volume, have a plenty of the needs of the structure, have a plenty of hard to avoid.