When referring to a reciprocating compressor cylinder is that volume contained in one end of the cylinder which is not swept by the movement of the piston. It includes space between piston and head at the end of the compression stroke, space under the valves, etc., and is expressed as a percentage of the piston displacement per stroke. Clearance may be different for the two ends of a double-acting cylinder. An average is generally used.
Clearance
21
Mar
