Patent ID: 7811067

Claim:
An air driven pump comprising a. an actuator including 1) operatively opposed air chambers, 2) air chamber passages, 3) an air valve having a) a cylinder in communication with the air chambers through each air chamber passage, respectively, b) a valve element in the cylinder, 4) an intake passage extending to the cylinder, 5) an intake adjuster having a) a closure element operatively mounted to move axially into and out of the intake passage with angular rotation of the closure element to selectively restrict the air flow rate in the intake passage, the ratio of advancement of the closure element to angular rotation of the closure element decreasing with the intake passage being progressively restricted by the closure element, and b) a first angular position with the intake passage at maximum selected restriction, c) a second angular position with the intake passage at minimum selected restriction, changes in flow rate through the inlet being equal for equal incremental angular rotation of the closure element between the first angular position and the second angular position, and b. a pump body including 1) at least one variable volume pump chamber and 2) a pumping element driven by the operatively opposed air chambers.