UG-40 governors are used for speed or load control of dual-fuel, diesel, or gas engines or steam turbines with governor drive speeds of 350 to 1050 rpm or 550 to 1300 rpm. They are typically used to drive alternators, DC generators, pumps, compressors, or marine propellers.
Governors with lever speed setting are primarily used for propulsion engines. Dial or motor speed setting is primarily used for power-generation installations.