Abstract: An air driven diaphragm pump includes two diaphragms affixed to a common shaft. The shaft extends through an air valve providing reciprocating pressurized air to the diaphragms through associated air chambers. A pump chamber with intake and exhaust valves is associated with one of the two diaphragms while a further air chamber replaces a pump chamber and is associated with the other of the diaphragms. A passage extends through the shaft and is in communication with the air chamber adjacent to the pump chamber and with the further air chamber converted from the pump chamber.

Abstract: An air driven double diaphragm pump has two opposed pumping cavities with diaphragms extending thereacross. A shaft extends between the diaphragms and through an actuator housing. The housing includes a control valve assembly having a control valve to direct pressurized air to one or the other of the dual pumping cavities and two relief valves which cooperate with the pump shaft position to release air from one end or the other of the control valve for the shifting thereof. Shuttle valve elements are positioned between the control valve and the pumping chambers. The shuttle valve elements are slidably positioned within the valve cavities to move between extreme positions under the pressures within the input and the pumping cavity. In one extreme position, the pumping cavity is in communication with an exhaust having a tapered passage. In the other, the exhaust is cut off and pressurized air is able to pass through a one-way valve in a passageway through the shuttle valve element to charge the pumping chamber.

Abstract: An air driven double diaphragm pump has two opposed pumping cavities with diaphragms extending thereacross. A shaft extends between the diaphragms and through an actuator housing. The housing includes a control valve assembly having a control valve to direct pressurized air to one or the other of the dual pumping cavities and two relief valves which cooperate with the pump shaft position to release air from one end or the other of the control valve for the shifting thereof. Shuttle valve elements are positioned between the control valve and the pumping chambers. The shuttle valve elements are slidably positioned within the valve cavities to move between extreme positions under the pressures within the input and the pumping cavity. In one extreme position, the pumping cavity is in communication with an exhaust having a tapered passage. In the other, the exhaust is cut off and pressurized air is able to pass through a one-way valve in a passageway through the shuttle valve element to charge the pumping chamber.

Abstract: An actuator valve for an air driven reciprocating device including a housing with a cylinder having a sliding valve piston located therein. The valve piston includes circumferential grooves near the ends of the piston to receive floating piston rings. The piston rings exhibit a positive clearance with the cylinder which allows axial airflow thereby. The housing provides an inlet extending into one side of the cylinder and passageways diametrically opposed extending from the cylinder. Controlled passageways at the ends of the cylinder alternately vent. Between venting, the cylinder accumulates pressure at both ends of the piston. With venting, the pressurized air at the unvented end of the piston shifts the piston toward the vented end. Bleed passageways extend from adjacent the inlet to the ends of the piston to assist shifting once the piston proceeds over center.