The Woodward UG-8L hydraulic governor, featuring part number 8520-099, is a heavy-duty, mechanical-hydraulic speed control device engineered specifically for reciprocating engines, diesel generators, gas engines, and industrial steam turbines.
Manufactured by Woodward, this governor provides precise speed regulation and output positioning by utilizing an internal hydraulic power amplifier system driven by engine or auxiliary oil pressure. It ensures stable, reliable speed control under fluctuating load conditions in critical power generation, marine propulsion, and industrial drive applications.
📊 Product Parameters & Technical Datasheet
• Brand: Woodward
• Model: UG-8L (8520-099)
• Series: UG Mechanical-Hydraulic Governor Line
• Product Name: Hydraulic Governor and Speed Control Actuator
• Country of Origin: United States / Netherlands
• Product Status: Industrial Prime Mover Control Hardware / Active & Replacement Part
• Dimensions: Standard Woodward UG vertical governor mounting form factor
• Weight: Approx. 14.5 kg
• Operating Fluid: Clean hydraulic oil or engine lubricating oil meeting specified viscosity standards
• Output Work Capacity: Robust hydraulic work output suitable for direct fuel rack positioning
• Discontinuation Status: Supported industrial product line with dedicated aftermarket availability and rebuilding services
⚙️ Parameter Setting & Modification Methods
Configuring and adjusting operating parameters on the UG-8L governor is performed mechanically and hydraulically using calibrated adjustment screws and internal spring settings.
Technicians adjust droop settings, compensation needles, speed adjusters, and maximum fuel stops directly on the governor housing. All adjustments must be executed strictly in accordance with Woodward technical manuals while the prime mover is operating under controlled conditions or static pre-checks to prevent engine overspeed.
🔄 Manual and Automatic Mode Switching
The governor operates through a self-contained mechanical-hydraulic feedback loop while allowing external speed references.
In automatic mode, the flyweight governor mechanism and internal compensating system continuously balance engine speed against spring tension, adjusting fuel delivery instantly to maintain constant speed under varying loads. Manual speed adjustments, shutdown overrides, or load sharing inputs can be engaged using physical control linkages, speed-setting motors, or pneumatic actuators during startup, testing, or operational tuning.
❓ Frequently Asked Questions (Q&A)
Q1: What is the primary function of the Woodward UG-8L governor?
A1: It acts as a mechanical-hydraulic speed control device designed to regulate fuel delivery and maintain constant speed on engines and turbines under changing loads.
Q2: What type of fluid is required to operate this governor?
A2: It requires clean, filtered hydraulic oil or lubricating oil maintained at correct viscosity and temperature ranges for proper hydraulic servo operation.
Q3: How is speed adjustment performed on the 8520-099 model?
A3: Speed changes are executed using a manual speed-adjusting screw or an optional remote electric/pneumatic speed setting actuator mounted to the governor.
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