Patent ID: 6874997

Claim:
A pump system, comprising: a pump including a pump head having an inlet and an outlet for a target fluid to be transferred and including a valve unit for routing said target fluid from said inlet to said outlet, a shaft passing through said pump head for reciprocating therethrough, first and second flexible members linked to both ends of said shaft to form first and second pump chambers at both sides of said pump shaft for introducing said target fluid through said valve unit, first and second cases for housing said first and second flexible members individually to form first and second actuating fluid chambers for introducing an actuating fluid into a space between the first flexible member and the first case and a space between the second flexible member and the second case, and first and second switching mechanisms detachably attached to said cases from outside and located in the axial direction at both sides of said shaft, having flow paths formed therein for branching part of said actuating fluid and including movable members reciprocating together with said shaft wherein in a state of normal operation the movable members are in contact but not rigidly attached to said shaft, in which said movable member opens said flow path to branch part of said actuating fluid as a control fluid when said shaft reaches one limit of reciprocation; and a switching valve mechanism for alternately distributing an actuating fluid supplied from an actuating fluid source to said pair of actuating fluid chambers using said control fluid branched at said switching mechanisms, wherein said actuating fluid is alternately introduced into said pair of actuating fluid chambers to drive said shaft back and forth in opposite phases to suck and discharge said target fluid.