Patent ID: 6846166

Claim:
A reciprocating pump for delivering fluid comprising: a diaphragm that is reciprocated so as to deliver fluid; a diaphragm drive chamber provided therein with said diaphragm; a drive-power supply member for supplying drive power for reciprocating said diaphragm; wherein drive power of said drive-power supply member is transmitted to said diaphragm within said diaphragm chamber via operating fluid and an operating-fluid-flow regulation chamber for regulating the flow of operating fluid is located between said drive-power supply member and said diaphragm drive chamber; a first gas discharge member and a second gas discharge member are respectively located in an upper part of the inside of said operating-fluid-flow regulation chamber and an upper part of the inside of said diaphragm drive chamber; said first gas discharge member is held in fluid communication with said second gas discharge member so as to constitute a single gas discharge mechanism, said single gas discharge mechanism being provided with a reverse-flow prevention member for preventing a reverse flow of fluid from said first gas discharge member to said second gas discharge member; said single gas discharge mechanism is made up by using said first gas discharge member, said second gas discharge member, said reverse-flow prevention member and a fluid-discharge adjusting member; and said fluid-discharge-adjusting member is made up by using a ball member provided above said reverse-flow prevention member, and an adjustment valve for adjusting a lift amount of said ball member.