Patent ID: 8246319

Claim:
A reciprocating pump for performing a pumping action by reciprocating members, each of which reciprocates inside one of a plurality of cylinder sections arranged in parallel, the reciprocating pump comprising: a seal case, in which one of said cylinder sections is formed, the seal case functioning as an independent pressure-resistant container; a suction valve and a discharge valve in which a valve chamber is formed individually, each of the valves functioning as an independent pressure-resistant container; and a front metal casing for storing a small diameter section at a front end side of the seal case, and the suction and discharge valves, a base metal casing for storing a back end side of said seal case; wherein said seal case is sandwiched between said front metal casing and said base metal casing; wherein said front metal casing and said based metal casing are coupled by a bolt; wherein said suction valve and said discharge valve are coupled so as to sandwich two planar sections from a direction perpendicular to a direction in which the plurality of cylinder sections are arranged in parallel in a state in which each of said suction valve and said discharge valve abuts against the respective one of said two planar sections of an external surface of the small diameter section at a front end side formed in said seal case, and each of the valve chambers formed in the suction and discharge valves is communicatively connected to one of the plurality of cylinder sections; wherein each of said suction and discharge valves is configured by unitizing a valve body for opening and closing a flow channel, a valve seat for seating and separating said valve body thereon and therefrom, an resilient body for urging said valve body in a direction to be seated, and a retention member for storing said valve body and said resilient body; wherein said front metal casing has an insertion opening for storing the small diameter section of said seal case and a through-hole formed to penetrate in a direction perpendicular to said two planar sections and to be communicatively connected to said insertion opening; and wherein the unitized valves are inserted and assembled into said front metal casing, each being abutted against said two planar sections of said seal case inserted into said front metal casing.