Air driven diaphragm pump

An air driven diaphragm pump comprising

• an actuator having a housing including opposed air chambers and air chamber passages, an air valve with a cylindrical bore and a valve piston therein, the air chamber passages extending from each air chamber, respectively, to the air valve, and a diffuser having an inlet at the cylindrical bore and an outlet displaced therefrom, the diffuser being tapered outwardly from the inlet toward the outlet;
• pump diaphragms extending across each air chamber, respectively, forming enclosed cavities;
• an exhaust housing including an expansion chamber about the diffuser, the exhaust housing including an outlet from the expansion chamber.

An actuator for an air driven reciprocating device having two air chambers with diaphragms extending across each air chamber, respectively, the actuator comprising

• an air valve including a cylindrical bore, a valve piston in the cylindrical bore and a diffuser having an inlet at the cylindrical bore and an outlet displaced therefrom, the diffuser being tapered outwardly from the inlet toward the outlet, the diffuser taper being oblong in cross section with the major axis extending transversely relative to the axis of the cylindrical bore of the air valve;
• air chamber passages extending from each air chamber, respectively, to the air valve.

An actuator for an air driven reciprocating device having two air chambers with diaphragms extending across each air chamber, respectively, the actuator comprising

• an air valve including a cylindrical bore, a valve piston in the cylindrical bore and a diffuser having an inlet at the cylindrical bore and an outlet displaced therefrom, the diffuser being tapered outwardly from the inlet toward the outlet;
• air chamber passages extending from each air chamber, respectively, to the air valve;
• an exhaust housing including an expansion chamber about the diffuser, the exhaust housing including an outlet from the expansion chamber.