Process Development & Control LLC is a leading manufacturer of industrial butterfly valves for HVAC, furnace, power, blower, and exhaust air transfer systems, in addition to special service applications. PDC is expanding to become your total flow control solutions provider. PDC offers customers a wide variety of materials for construction options and design specifications. Our experience in the design and fabrication of quality valve assemblies has gained worldwide customer acceptance. Products include Electric Actuators, Pneumatic Actuators, Electro-Hydraulic Actuators, Butterfly Damper Valves, Elastomer Check Valves, AWWA Valves, Double Off-Set Valves, Triple Off-Set Valves, High-Performance Valves, and accessories for flow control.