Description
Woodward 8522-746
Technical Specifications:
- Control Method: Mechanical-hydraulic droop speed control.
- Speed Range: Typically covers 500 – 3000 RPM (depending on specific configuration).
- Oil Source: Self-contained with integrated gear pump and reservoir.
Functional Features:
- Independent Operation: Completely self-sufficient without requiring external auxiliary systems.
- High Reliability: Pure mechanical-hydraulic structure ensures stable operation in extreme and harsh environments.
- Stepless Speed Control: Supports smooth, stepless manual and automatic speed adjustment.
Application Scenarios:
Ideal for small steam turbines, gas engines, diesel-driven pumps, and compressors operating as single units without the need for grid synchronization.
Performance Parameters:
- Steady-State Speed Droop: Adjustable between 3% and 5%.
- Insensitivity: Less than 0.15%.
- Output Torque: Sufficient to directly drive standard steam valve linkage mechanisms.
Material Composition:
Housing is made of high-strength cast iron or cast steel. Internal flyweights, sliding valves, and springs are manufactured from wear-resistant alloy steel.
Structural Features:
Compact integrated design combining speed sensing, hydraulic servo cylinder, gear pump, and accumulator. Features clearly labeled manual speed and load adjustment knobs on the exterior.
Working Principle:
Changes in engine speed alter the centrifugal force on the flyweights, moving the sliding valve. This directs pressure oil into the servo cylinder, pushing the throttle or steam valve to adjust the fuel/steam intake until the speed stabilizes at the new setpoint.
Installation Requirements:
Must be securely mounted on the prime mover base, ensuring strict concentricity between the drive shaft and the engine crankshaft. The governor must be filled with the specified grade of turbine oil.
Usage Precautions:
Regularly check oil level and quality. Use specialized tools when adjusting the steady-state speed droop. Drain internal oil before long-term storage to prevent corrosion.
