Piston type compressor having suction structure with arcuately shaped suction valve

A piston type compressor comprising:

• a housing having cylinder bores, a suction chamber, a discharge chamber, suction ports and discharge ports formed therein;
• pistons reciprocatingly arranged in said cylinder bores;
• a drive shaft rotatably supported by said housing;
• a transmission mechanism operatively coupled to said drive shaft and said pistons for converting rotation of said drive shaft into reciprocal movement of the pistons;
• suction valves to open and close the suction ports;
• discharge valves to open and close the discharge ports;
• wherein each said suction valve has a proximal end portion and a distal end portion on the opposite side of the proximal end portion, said distal end portion of said suction valve having an outer contour line including a distal end forming line located near a circumferential surface of said cylinder bore and side lines located on either side of said distal end forming line, each said suction port having a contour line including a distal end line located near the circumferential surface of the cylinder bore and side lines located on either side of said distal end line;
• and
• said distal end forming line of said suction valve and said distal end line of said suction port being arranged along said circumferential surface of said cylinder bore, so that a gap between said distal end forming line and said distal end line with respect to a radial line of a circle forming the circumferential surface of the cylinder bore is substantially constant and a gap between said distal end forming line and said circumferential surface of said cylinder bore with respect to said radial line is substantially constant.