Structure for suction valve of piston type compressor

A structure of a suction valve of a piston type compressor in which a suction port for sucking refrigerant gas is opened and closed by the suction valve, and refrigerant gas is sucked into a cylinder bore by the suction valve which is pulled apart from the suction port by a sucking motion of a piston arranged in a cylinder bore, the structure of the suction valve comprising:

• a plurality of suction ports corresponding to one cylinder bore;
• a plurality of suctions valves corresponding to each suction port, respectively;
• a plurality of maximum opening degree restricting means for restricting the maximum opening degree of each suction valve when the maximum opening degree restricting means comes into contact with each suction valve, corresponding to each suction valve, respectively;
• a plurality of opening performance restricting means for restricting the opening performance of the suction valves to open the suction ports, corresponding to each suction port, respectively;
• wherein the opening performance restricting means is an area of the cross section of each suction port;
• and
• wherein the opening and closing motions of the plurality of suction valves are made independent from each other, and the opening performance of at least one of the plurality of suction valves is enhanced more than the opening performance of at least one of the other suction valves.