Straight cylinder gas compressor with a reduced diameter compression chamber

A gas compressor, comprising:

• a straight cylinder having (a) a longitudinal axis, and (b) a circumferential wall;
• a cylindrical sleeve, within said cylinder, extending from one axial end of said cylinder to substantially a mid-length of said cylinder;
• a first, one-way valve assembly removably set within said cylinder, in adjacency to one axial end thereof;
• a second, centrally-bored, one-way valve assembly removably set within said sleeve, in adjacency to the opposite axial end of said cylinder;
• a piston rod reciprocably disposed within said cylinder and said sleeve, and in slidable penetration of said second valve assembly;
• wherein
• said rod has a terminal, drive end extending outwardly from said cylinder;
• a third, one-way valve assembly coupled to an innermost end of said rod;
• a fourth, one-way valve assembly coupled to, and intermediate the length of, said rod;
• radial porting formed in said wall for admitting gas to said first valve assembly;
• and
• radial porting formed in said wall and said sleeve for discharging compressed gas from said second valve assembly;
• wherein
• said first and third valve assemblies comprise means cooperative with reciprocation of said rod for compressing admitted gas to a first stage of compression;
• said second and fourth valve assemblies comprise means cooperative with such reciprocation of said rod for compressing admitted gas to a second stage of compression;
• said third valve assembly is sealingly engaged with the inner surface of said cylinder;
• and
• said fourth valve assembly is sealingly engaged with the inner surface of said sleeve.