The Woodward UG-25+ Actuator is a microprocessor-controlled, mechanical-hydraulic amplified, actuator for controlling diesel, gas, and dual fuel engines, and steam turbines, and obtains the muscle needed from a standard UG-type engine drive. It takes a standard 4 mA to 20 mA position command control signal from an electronic control system and converts it into a proportional 42 degrees of terminal shaft position to control engine fuel flow.
This fast-acting, high-work-output actuator has no need for any auxiliary devices such as a start booster or oil cooler. Two work output versions are available: 34 J (25 ft-lb) and 41 J (31 ft-lb) with maximum continuous speeds of 1200 rpm (drive shaft speed) for the 0.875 inch (22.22 mm) pump and 1700 rpm (drive shaft speed) for the 0.625 inch (15.88 mm) pump.
The UG-25+ Actuator uses a 1034 kPa (150 psi) internal operating pressure with an internal oil pump driven from the actuator’s drive shaft. Oil pressure is maintained by a relief valve system with a drain to an internal oil sump. No separate oil supply is required.