Description
1. Product Overview
Part Number: 8516-039 (G8516-039, TG-13 Series Mechanical-Hydraulic Governor)
Manufacturer: Woodward, USA. It is a legacy EOL spare part of classic TG hydraulic governor series for direct drop-in replacement on legacy turbine units.Product Definition: TG-13F mechanical-hydraulic turbine governor complying with API-611 standard, designed for medium & small steam turbines. It realizes closed-loop speed regulation and load sharing control. Equipped with an integrated self-contained oil sump without external hydraulic oil supply, the output shaft directly drives turbine governing valve actuators. It is widely applied in thermal power cogeneration units, process drive turbines, and petrochemical power turbines for maintenance replacement and technical renovation.2. Hardware Structure & Functional Units
2.1 Integrated Hydraulic Power & Drive Unit
Built-in closed oil reservoir and hydraulic pump to establish internal control pressure independently. Hydraulic amplification converts speed deviation signal into mechanical torque to adjust valve opening and steam intake, forming a closed speed control loop without external pressure oil piping.
2.2 Centrifugal Flyweight Speed Sensing Unit
Mechanical flyweight structure detects rotating speed via turbine gear drive. Centrifugal displacement directly feeds into hydraulic servo valve without A/D conversion, featuring ultra-short response path and strong anti-EMI performance for fully mechanical control systems.
2.3 Droop Adjustment & Load Sharing Unit
Mechanically configurable speed droop setting enables automatic active power load distribution for parallel-connected turbine sets. Switchable configuration for islanded operation and grid-parallel operation to avoid load hunting and power drift.
2.4 Overspeed Trip & Safety Interlock Unit
Built-in mechanical overspeed limit mechanism locks output stroke once rotational speed exceeds threshold to restrict excessive valve opening, and links with emergency trip system for unit shutdown. Minimum stroke limit prevents turbine surge and flameout under no-load low steam flow condition.
2.5 Weatherproof Enclosure & Durable Mechanical Structure
NEMA Class A weatherproof sealed housing prevents ingress of rain, dust and corrosive gas. Hardened transmission gears and servo spools minimize wear. No electronic wearable parts; only periodic oil replacement is required for long-term operation matching turbine overhaul cycles.
3. Detailed Technical Specifications
3.1 Core Mechanical & Control Parameters
| Item | Specification |
|---|---|
| Model | 8516-039 (TG-13F) Mechanical-Hydraulic Governor |
| Adjustable Speed Range | 2400～4400 rpm |
| Rated Reference Speed | 3600 rpm |
| Overspeed Trip Reference Speed | 4400 rpm |
| Rated Output Torque | 12 ft-lb (16 N·m) |
| Output Shaft Rotation | Counter-Clockwise (CCW) |
| Droop Feature | Continuously mechanically adjustable for parallel load sharing |
| Oil Supply | Integrated on-board sump, no external pressure oil required |
| Enclosure Rating | NEMA A weatherproof sealed construction |
| Net Weight | Approx. 0.8kg |
3.2 Environmental Parameters
- Operating Temperature: -20℃ ~ +70℃
- Storage & Transit Temperature: -40℃ ~ +85℃
- Humidity: 5%~95%RH non-condensing, resistant to mild salt fog and process corrosive gas
- Vibration Resistance: Designed for continuous base vibration of turbine units
- Mounting Mode: Bracket wall mount or flange direct mounting on turbine body
3.3 Mechanical Dimension Parameters
- Overall Dimension: 8.4 × 5.4 × 1.9 inches (213mm × 137mm × 48mm)
- Mounting Interface: 12-thread standard drive shaft with original factory linkage adapter
- Material: Die-cast aluminum housing, stainless steel hydraulic spools, hardened steel flyweight assembly
4. Product Advantages
- Pure mechanical-hydraulic design with zero electronic components, maintaining full speed control even under total loss of electrical automation system for fail-safe protection.
- Self-contained oil tank eliminates external high-pressure piping, reducing leakage and blockage failure points and simplifying on-site installation.
- Mechanically fixed droop characteristic avoids software and signal drift, ensuring stable load sharing for multi-turbine grid-parallel operation.
- NEMA A outdoor sealed housing allows direct installation on turbine body without extra control cabinet protection, adapting to dusty, humid and oily industrial sites.
- Minimal moving parts with hardened wear components, requiring only regular oil change for low maintenance and unattended operation.
- Standard TG series form factor enables plug-and-play replacement without modification to turbine linkage and mounting base, shortening unit outage duration during maintenance.
5. Application Scenarios
Speed regulation and load control for backpressure/extraction steam turbine generator sets in thermal power & cogeneration plants; process turbine driving compressors and pumps in petrochemical facilities; retrofitting legacy electronic governor systems to mechanical redundant control for steel and paper mill captive power plants; spare part replacement for aged, leaking or stuck TG-series governors during unit overhaul.
