Maintains, adjusts, and repairs electric motor driven valves, electro-hydraulic valves and air diaphragm motor valves with needle type, double seated type or three-way type inner valves in lines associated with control systems for production of steam and chilled water (e.g., continuous blow down lines, condensate lines, city water supply, boiler feed water, condenser water lines and chilled water lines). Duties include: Performs, maintains, adjusts, troubleshoots and repairs pneumatic and digital control mechanisms (e.g., level and pressure transmitters, relays, valve positioners, power drives, pneumatic and electric operated valves, pressure controllers and similar mechanisms), refrigerant leak monitors, emissions monitoring equipment, opacity systems, and electromechanical control mechanisms (e.g., water softener and de-alkalizer control system, fly ash system and chemical field process equipment.