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An air driven diaphragm pump having an actuator valve for converting a source of compressed air into a reciprocating drive. The actuator valve includes a valve piston for alternately directing air to one side or the other of the pumps, a control rod fixed to the reciprocating elements of the pump an

An air driven diaphragm pump having an actuator valve for converting a source of compressed air into a reciprocating drive. The actuator valve includes a valve piston for alternately directing air to one side or the other of the pumps, a control rod fixed to the reciprocating elements of the pump and means for shifting the valve piston responsive to the position of the control rod. An axially spaced bifurcated inlet is employed to provide additional energy to the shifting of the valve piston. The valve piston also is arranged to cover vent ports as a mechanism for closing off all compressed air under stalled conditions of the pump.

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1. An actuator valve for an air driven reciprocating device, in combination comprising a valve piston having a single transverse passage; a control rod fixed to reciprocate with the air driven reciprocating device; a housing having a cylinder closed at each end and enclosing said valve piston,

1. An actuator valve for an air driven reciprocating device, in combination comprising a valve piston having a single transverse passage; a control rod fixed to reciprocate with the air driven reciprocating device; a housing having a cylinder closed at each end and enclosing said valve piston, a passageway through which said control rod extends, an air inlet to said cylinder spaced from the ends of said cylinder, valve piston vent passages extending from said cylinder to said passageway, and control rod vent passage means for venting said passageway extending from said passageway to atmosphere, said valve piston cooperating with said housing to include means for directing incoming air to the ends of said valve piston and means for selectively directing incoming air to and exhausting outgoing air from the air driven reciprocating device, said air inlet including two ports axially spaced at said cylinder, said ports selectively aligning with said transverse passage when said piston is at the ends of said cylinder and said control rod including at least one axial passage in said control rod to cooperate with said valve piston vent passages and said control rod vent passage means. 2. An actuator valve for an air driven reciprocating device, in combination comprising a valve piston having a single transverse passage; a control rod fixed to reciprocate with the air driven reciprocating device; a housing having a cylinder closed at each end and enclosing said valve piston, passageway through which said control rod extends, an air inlet to said cylinder spaced from the ends of said cylinder, valve piston vent passages extending from said cylinder to said passageway, and control rod vent passage means for venting said passageway extending from said passageway to atmosphere, said valve piston cooperating with said housing to include means for directing incoming air to the ends of said valve piston and means for selectively directing incoming air to and exhausting outgoing air from the air driven reciprocating device, said air inlet including two ports axially spaced at said cylinder and two inlet passages extending to said two ports, said inlet passages being inclined to mutually diverge toward said ports, said ports selectively aligning with said transverse passage when said piston is at the ends of said cylinder and said control rod including at least one axial passage in said control rod to cooperate with said valve piston vent passages and said control rod vent passage means. 3. An actuator valve for an air driven reciprocating device, in combination comprising a valve piston having a single transverse passage, said transverse passage being a circumferential groove about said valve piston; a control rod fixed to reciprocate with the air driven reciprocating device; a housing having a cylinder closed at each end and enclosing said valve piston, a passageway through which said control rod extends, an air inlet to said cylinder spaced from the ends of said cylinder, valve piston vent passages extending from said cylinder to said passageway, and control rod vent passage means for venting said passageway entending from said passageway to atmosphere, said valve piston cooperating with said housing to include means for directing incoming air to the ends of said valve piston and means for selectively directing incoming air to and exhausting outgoing air from the air driven reciprocating device, said air inlet including two ports axially spaced at said cylinder and two inlet passages extending to said two ports, said inlet passages being inclined to mutually diverge toward said ports, said ports selectively aligning with said transverse passage when said piston is at the ends of said cylinder and said control rod including at least one axial passage in said control rod to cooperate with said valve piston vent passages and said control rod vent passage means. 4. An actuator valve for an air driven reciprocating device, in combination comprising a valve piston having a single transverse passage; a control rod fixed to reciprocate with the air driven reciprocating device; a housing having a cylinder closed at each end and enclosing said valve piston, a passageway through which said control rod extends, an air inlet to said cylinder spaced from the ends of said cylinder, valve piston vent passages extending from said cylinder to said passageway, and control rod vent passage means for venting said passageway extending from said passageway to atmosphere, said valve piston cooperating with said housing to include means for directing incoming air to the ends of said valve piston and means for selectively directing incoming air to and exhausting outgoing air from the air driven reciprocating device, said air inlet including two ports axially spaced at said cylinder, said ports selectively aligning with said transverse passage when said piston is at the ends of said cylinder and said control rod including at least one axial passage in said control rod to cooperate with said valve piston vent passages and said control rod vent passage means, said axially spaced ports being separated by at least the width of said transverse passage.