Woodward UG-Actuator Governor B8251-762

Woodward UG-Actuator Governor (Part No. B8251-762) – NEW

Woodward UG-Actuator Governor Part No. : B8251-762 – NEW is a proportional electrohydraulic actuator which converts electrical control inputs from analog or digital controllers into mechanical shaft rotation. UG-8 physical mounting and linkage arrangements are employed while allowing seamless incorporation of modern electronic engine control.

The unit has an internal self contained oil sump and an internal gerotor pump, therefore eliminating the need for external hydraulic lines. This device is capable of operating efficiently at regular industrial pump speeds, and can give up to 20 ft-lb (27.2 J) of dynamic output work to drive engine fuel racks, steam valves or gas metering controls.

Model Details

• Manufacturer: Woodward, Inc.
• Model Series: UG-Actuator Series
• Manufacturer Part Number (MPN): B8251-762
• Assembly Type: Hydraulic Powered Electric Actuator
• Condition: NEW Unused Factory Surplus

Key Features

1. Self-Contained Hydraulic System: Integrated 1.4 L (1.5 qt) oil sump and gerotor pump eliminate external oil feed lines.
2. Drop-In UG-8 Replacement: Fits existing UG-8 mounting drive bases and linkage connections without mechanical modification.
3. High Output Work Capacity: Delivers up to 20 ft-lb (27.2 J) work capacity over a 42-degree rotary shaft rotation.
4. Versatile Controller Compatibility: Pairs with Woodward 2301A, 500-series, 700-series, and MicroNet control systems.
5. Rapid Response Time: Features a fast dynamic response time constant of 70–90 ms for quick transient speed recovery.

Terminal Allocations & Electrical Connections

• Pin A: Control Signal (+) / Coil Input
• Pin B: Control Signal (-) / Coil Return
• Pin C: Chassis / Shield Ground Connection
• LVDT Models (10-Pin MIL-STD Connector): Pins dedicated to position excitation supply and differential feedback signal output for precise position monitoring.

Compatible Equipment Models

• Caterpillar Engines: CAT 3616, CAT 3612, CAT 3608, CAT 3516 series
• Wärtsilä Engines: VASA 32, 20 series medium-speed marine diesel engines
• MAN Energy Solutions: L23/30, L28/32 marine auxiliary generator engines
• B&W, Cooper-Bessemer, and Enterprise: Large stationary power generation engines
• Turbine Systems: Industrial steam turbines and light gas turbine fuel control systems

Part Number Cross-References

• Woodward Part Numbers: B8251-762, 8251-762, 37511, 37512, 8251-760
• System Alternatives: UG-8, UG-10, UG-25+, EGB-2P, EGB-10P

Applications

• Marine main propulsion engines and heavy vessel shaft generators
• Marine auxiliary generator sets (Gensets) requiring precise frequency control
• Stationary diesel and gas engine power plants running in paralleling modes
• Steam turbine speed and load control units in marine and industrial facilities
• Gas compression stations and pipeline pumping plants

Frequently Asked Questions

What is the primary function of the Woodward UG-Actuator B8251-762?

The Woodward UG-Actuator B8251-762 converts an electrical current signal (20–160 mA) from an electronic governor controller into proportional rotary shaft output to regulate fuel injection pumps or control valves on engines and turbines.

Can the UG-Actuator B8251-762 directly replace a standard UG-8 governor?

Yes, the UG-Actuator uses the same cast-iron case footprint, drive shaft splines, and mounting pattern as standard UG-8 governors, allowing drop-in installation without physical engine modifications.

What drive oil should be used in the UG-Actuator?

In most marine and industrial applications, the actuator can utilize the same clean oil type and viscosity rating used in the engine crankcase, provided it complies with Woodward Publication 25071 recommendations.

Does the UG-Actuator require an external hydraulic oil pump supply?

No, the UG-Actuator contains an integrated oil sump (1.4-liter capacity) and internal gerotor pump, making it completely self-contained without needing external hydraulic oil lines.