Donjoy Valve Control Unit C-TOP-1721 is a straight-stroke pneumatic valve control unit designed for valve process control. It‘’s compatible with most PLC (programmable logic controller) automation systems with digital communication or bus communication (AS- I BUS). Including position feedback output, three-segment LED display, anti-leak function, valve opening and closing control, etc., It used to control all types of process valves. It can be installed on various pneumatic valves, e.g. pneumatic butterfly valves, ball valves, diaphragm valves, angle seat valves, globe valves, reversing valves, mixing proof valves, etc.