Woodward UG-8L UG series mechanical hydraulic governors controlling diesel

Woodward UG-8L is a mechanical-hydraulic governor in the UG series, suitable for controlling diesel, gas, dual - fuel engines or steam turbines. Here is a detailed introduction:

Structural Characteristics

Drive mechanism: Driven by the engine or turbine through an appropriate UG drive, with a maximum drive speed of 1500-1600 rpm. The drive shaft is driven by the diesel - generator camshaft through a bevel gear transmission, and then transmits the rotational speed signal of the diesel generator to the sensing mechanism through components such as the oil pump gear, elastic shaft, transmission gear, and flyweight frame.

Speed-sensing mechanism: Consists of flyweights, a conical speed-regulating spring, and a speed-regulating lever, which is used to sense and reflect changes in rotational speed.

Servo-amplification mechanism: Comprises a control slide valve, a control slide valve sleeve, a power piston, and related oil passages. The sleeve is driven by the drive shaft to rotate.

Regulating mechanism: Consists of a power piston, an output shaft, and an oil - quantity regulating rod, etc., which is used to pull the fuel - regulating rod to adjust the fuel supply.

Constant-speed (elastic) feedback mechanism: Mainly includes a large feedback piston, a small feedback piston, upper and lower feedback springs, a compensation needle valve, a feedback lever and a movable fulcrum, a feedback pointer, and a feedback oil passage. Its function is to ensure the stability of the rotational speed during the speed - regulating process.

Speed-droop (static-speed-difference) mechanism: Mainly consists of a speed - droop knob, a cam, a push - rod, a tension spring, a support pin, a speed - droop lever, and a speed - droop pointer. It is a rigid feedback mechanism that can not only stabilize the adjustment process but also adjust the stable speed - droop rate δ2 to meet the requirements of adjustment stability and parallel operation.

Speed-setting mechanism: Comprises two parts. One part consists of a speed - regulating knob, a transmission gear, and a speed - regulating gear; the other part consists of a speed - regulating motor and a worm - gear reduction mechanism, etc. The former is used for manual adjustment in front of the governor, and the latter is used for remote adjustment at the switchboard. Both can change the stable rotational speed of the diesel - generator by changing the pre - tightening force of the spring.

Load - limiting mechanism: Consists of a load - limiting knob, a load - limiting pointer, a load - limiting cam, a control lever, an emergency - stop lever, a limiting lever, a limiting pin, a rack, a gear, and a load pointer. Pressing the emergency - stop lever can lift the slide valve, and the power piston moves downward to reduce fuel and stop the engine.

Hydraulic system: Comprises a low - pressure oil sump, a gear pump, a pressure - stabilizing oil cylinder, a pressure - stabilizing piston, and related oil passages, which is used to generate and maintain the specified oil pressure.

Functional Characteristics

Dual - mode operation: It can operate in both isochronous and droop modes. The isochronous mode can maintain a constant speed regardless of the load, while the droop mode is used to distribute and balance the load between two engines during parallel operation or grid - connected power generation.

Load - limiting function: The load - limiting dial display can limit the travel of the governor output shaft to restrict the fuel supply and can also be used to stop the prime mover.

Speed - adjustment function: The speed - adjustment knob is used to manually increase and decrease the speed. For the governor equipped with an electric speed - adjustment motor, the motor can adjust the governor to reach its maximum and minimum speeds.