Description
Woodward A8521-399
Technical Specifications
- Product Series: UG-10D Mechanical-Hydraulic Governor.
- Speed Setting: Manual knob adjustment or optional pneumatic/electric remote speed setting.
- Power Source: Self-contained; driven directly by the engine’s camshaft or accessory drive.
- Droop Characteristic: Adjustable speed droop (typically 0-5%) for parallel generator operation.
Functional Features
- Self-Contained Operation: Requires no external electrical power or hydraulic supply, ensuring operation during blackouts.
- Isochronous/Droop Capability: Can be configured for standalone isochronous operation or droop operation for load sharing.
- High Torque Output: Capable of directly driving large fuel racks or steam valves without auxiliary servos.
- Proven Reliability: Decades of field-proven mechanical design for harsh environments.
Application Scenarios
Widely used on diesel and gas engine-driven generator sets, marine propulsion engines, and mechanical drive compressors and pumps.
Performance Parameters
- Speed Regulation: Stable speed control with adjustable droop for load sharing.
- Response: Immediate mechanical response to load changes via flyweight action.
Material Composition
Cast iron or aluminum housing. Precision-machined steel flyweights, pilot valves, and power pistons. Internal oil reservoir and gear-driven pump.
Structural Characteristics
Compact, flange-mounted design. Features a manual speed knob, droop adjustment screw, and oil fill/drain/level ports. Mechanical linkage output lever.
Working Principle
Engine-driven flyweights rotate at a speed proportional to engine RPM. Changes in speed alter the centrifugal force, moving a pilot valve that directs oil pressure to a power piston. The piston moves the fuel rack or steam valve to restore the set speed.
Installation Requirements
Mount securely to the engine drive pad. Fill with the recommended hydraulic oil and bleed air from the system. Link the output lever to the fuel rack ensuring smooth, friction-free movement.
Usage Precautions
- Maintain proper oil level and cleanliness; contaminated oil is the primary cause of governor failure.
- Adjust droop settings carefully when operating generators in parallel.
- Inspect mechanical linkages for wear, binding, or excessive backlash.
