The UG-40 is most commonly used for speed or load control of larger dual fuel, diesel, or gas engines and steam turbines

The UG-40 has dashpot compensation; different from that of PG governors in that there is no hydraulic bias of the pilot valve. It is accomplished instead through linkage and a dashpot system arrangement. Finally, it has the same shut down and motor options as the smaller UG-8D family range of governors.