Deltrol Controls is a division of Deltrol Corp. Deltrol Corp. is a company involved in the development and manufacture of electromechanical controls and hydraulic systems and components. Deltrol Controls manufactures electromechanical components and assemblies. For over 40 years, it has been designing and manufacturing solenoids, relays, dispensing valves, inlet valves and other custom switches. The company's products find uses in a number of applications, including heating ventilating and air conditioning (HVAC) vending equipment, security systems, engine controls, office equipment, and many more. Located in Milwaukee, Wis., the company has a 110,000 square foot manufacturing facility. It also customizes standard products as well as desigs new products specific to an application.