The best choice for applications requiring pneumatically actuated true union ball valves, three-way ball valves or butterfly valves. These actuators are available in models with appropriate torque outputs for all valves from 1/4" all the way up to 24" pipeline size. PCD actuators are air-to-air (double acting) and require air pressure for both actuation cycles, open and close. Actuators feature a four piston rack and pinion design. This design results in a high torque output actuator, yet one that is very lightweight and compact in comparison with other rack and pinion actuators. Can be operated manually in the event of air or electric failure. Additional options available, contact us for quote. #20651 works with 1/2" - 2" true union and three way/three way lateral valves. #20652 works with 2-1/2" - 4" true union, 1-1/2" 3" butterfly and 3" - 4" three way/three way laterals. #20653 works with 4" butterfly. Valves sold separately.