PISTON TYPE COMPRESSOR

摘要

The subject of the present invention provides a piston type compressor to reduce a leaked remaining gas from a bypass passage through which a remaining gas is circulated. The piston type compressor comprises: a rotation valve (40) on a side (11) of one end of a rotational shaft. The rotation valve (40) comprises: an inhale hole (41) to enable a bore to inhale coolant gas by sequentially connecting a plurality of bores and a supply passage through conductive paths (341-344); and the bypass passage (43) to connect a first conductive path (341) of the bore to a second conductive path (342) of a following bore when an inner pressure of the bore is higher than the inner pressure of the following bore next to the bore. The bypass passage (43) is a groove formed straightly along with a circumferential direction of a rotational shaft (10), and is located in a direction vertical to a shaft line of the rotational shaft (10).