The UG MAS is a pressure compensated, hydraulic governor designed to accept a standard 4–20 mA electrical current signal to set the speed of the governor.
An internal pump, relief valve, and accumulator system maintain the governor operating pressure. A self-contained sump stores the oil and so reduces the possibility of contamination from outside sources.
Oil flow to and from the governor power cylinder assembly is controlled by a ballhead and pilot-valve assembly. The power cylinder positions the fuel rack, fuel valve, or steam valve of the engine or turbine. Governor stability is provided by an adjustable needle valve and a spring-loaded buffer compensation system.