FIELD: compressor equipment. SUBSTANCE: proposed device is meant for compression of gas and can be used in small-capacity piston compressors. Cylindrical pair of compressor is manufactured in the form of gas-static suspension. Contact-free sealing ring made from antifriction material and having coefficient of thermal expansion bigger than those of materials of cylinder and piston is installed in upper part of piston. Ring is solid and has outer diameter equal to or smaller than diameter of surface of piston to form gas-static suspension with internal surface of cylinder. Cylindrical collect chuck which tabs rest against internal surface of sealing ring can be positioned in piston concentric to its outer surface. Coefficient of thermal expansion of sealing ring is chosen from certain relation. EFFECT: increased reliability and efficiency of compressor as result of such make of sealing. 2 cl, 3 dwg
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