Woodward UG-40 UG series mechanical hydraulic governors controlling diesel

Woodward UG-40 is a mechanical - hydraulic governor in the UG series, which is mainly used for the speed or load control of larger dual-fuel, diesel, or gas engines and steam turbines. Here is a detailed introduction:

Working Principle

Similar to other UG-series lever governors, the UG-40 operates based on the centrifugal force generated by the rotation of its drive shaft. When the engine operates at a set speed, the drive shaft of the governor rotates, causing the flyweights to move outward under centrifugal force. When the centrifugal force equals the spring force of the speed - regulating spring, the main control valve plunger stops moving and blocks the control hole on the rotating sleeve, halting the movement of the power piston and the output shaft, thus keeping the engine running steadily at the set speed. When the engine load changes, the corresponding adjustments are made by moving the output shaft to increase or decrease the fuel supply to maintain the engine speed.

Structural Features

Drive mechanism: It is driven by the engine or turbine through a suitable UG drive, with a governor drive speed ranging from 350 to 1050 rpm or 550 to 1300 rpm.

Oil supply system: It has a self - contained oil sump, eliminating the need for a separate oil supply. The oil pump, which is a positive - displacement gear pump with four check valves, can rotate in both directions.

Output shaft: The output shaft provides 38 ° of travel for a maximum work output of 50 ft - lb (67 J). The recommended rotation is 2/3 of the maximum, i.e., 25 °, for a work output of 33 ft - lb (45 J). It is mechanically linked to the fuel system to control the fuel supply.

Functional Characteristics

Speed setting methods: Governors with lever speed setting are primarily used for propulsion engines, while dial or motor speed setting is mainly used for power - generation installations.

Droop and compensation: The UG-40 governor has adjustable droop, which allows load sharing between multiple engines or power generation against an infinite bus. It also has adjustable compensation to enable isochronous speed control. A pointer on the governor sets and indicates the amount of compensation.

Load - limit control: A standard feature of the UG - 40 dial governor is a load - limit control that restricts the travel of the governor output shaft to limit the amount of fuel supplied. An indicator dial shows the setting of the governor - output - shaft limit position. The load - limit control can also be used to shut down the engine by turning it to zero. Load limit is available on the lever governor as a factory option.

Special Features and Options

Digital interface: The UG 40-DI has all the features of the traditional UG - 40 governor, but with a digital interface for remote speed setting, start fuel limiting, and shutdown. It has extensive alarm and diagnostics features to monitor the condition of the governor functions.

Shutdown devices: A number of special shutdown devices are available, such as electric shutdown solenoids (either de - energized or energized type) and pressure - actuated air, oil, or water shutdown units (operating with pressures of 69, 138, or 414 kPa).

Booster servo motor: A booster servo motor can be used to supply pressure oil to the governor when starting air is supplied to the engine, which is beneficial for quick engine starts, conserves starting air, and improves the maneuverability of vessels using direct reversible engines.