Johnson Controls V-3766-1001 Pneumatic Valve Actuator, 3 to 13 Spring: Industrial Ball Valves: Amazon.com: Industrial & Scientific
GOODYEAR Digital Oil Control Valve Meter Nozzle 10 GPM / 35 LPM Heavy Duty Air Operated Pneumatic 1/2" inch NPT Inlet Pressure Range 7-1500 Psi 5-100 Bar with Flexible Spout (Not for Gasoline)
Valves for Pneumatic Cylinders and Actuators - Tech Briefs