Description
Commercial and Supply Chain Status
- Condition: New Original (Factory Surplus) or Remanufactured (Tested to OEM Specifications)
- Warranty: 12-Month Mechanical and Performance Warranty
- Availability: Stock varies; typically available as an exchange unit or built-to-order based on application parameters
- Lead Time: Ships within 3 to 7 business days depending on specific calibration settings (e.g., rotation direction, speed range)
- Pricing: Price subject to configuration requirements and core exchange values; contact us for a firm quote.
Technical Specifications
| Parameter | Value |
| Governor Type | Mechanical-Hydraulic, Speed Droop |
| Application | Small steam turbines, small gas engines |
| Work Output Capacity | 16.3 N·m (12 lb-ft) maximum linear output work |
| Internal Oil Sump | Self-contained, 1.7-liter capacity (Requires high-quality turbine oil) |
| Speed Range Options | 1,100 to 2,400 rpm, 2,200 to 4,800 rpm, or 3,600 to 6,000 rpm (Specify at order) |
| Drive Shaft Rotation | Clockwise (CW) or Counterclockwise (CCW) available |
| Required Input Drive Speed | Matches internal flyweight assembly calibration |
| Droop Adjustment | Internal adjustment from 0% to more than 10% |
| Enclosure Material | Heavy-duty cast iron housing |
Operating Mechanism and Fluid Architecture
The TG-13 governor operates on a self-contained hydraulic system driven by an internal pump. It does not require an external oil supply, making it highly reliable for remote or critical standby mechanical-drive turbines.
Internal Regulation Loop
- Speed Sensing: An internal flyweight assembly is driven directly by the turbine or engine shaft via a keyed drive shaft. Centrifugal force pushes the flyweights outward against a speeder spring.
- Hydraulic Amplification: A change in speed shifts the internal pilot valve plunger. This controls the flow of pressurized oil from the internal gear pump to either side of the power cylinder piston.
- Terminal Output: The power cylinder moves a terminal lever (or terminal shaft), which connects directly to the turbine governor valve or fuel metering system via mechanical linkage.
Droop Functionality
The TG-13 is a droop governor, meaning it allows speed to decrease slightly as load increases. This characteristic is vital for stable load sharing when the turbine operates in parallel with other prime movers, preventing “hunting” or unstable load swinging.
Engineering Insights: Installation and Lifecycle Maintenance
Drive Shaft and Rotation Verification
⚠️ CRITICAL CONFIGURATION NOTE: The TG-13 must be ordered with the exact rotation direction (CW or CCW) matching the turbine drive pad. Running the governor in the opposite direction of its factory build configuration will prevent the internal oil pump from building pressure, rendering the governor completely inoperative and risking mechanical damage.
Oil Maintenance and Selection
Because the TG-13 uses its internal oil supply for both lubrication and hydraulic actuation, fluid cleanliness is critical.
- Use a high-quality, continuous-service mineral oil with anti-foaming and anti-oxidation additives (typically ISO VG 32 to ISO VG 68 depending on ambient operating temperature).
- Check the sight glass daily. Change the internal oil every 6 months or after 2,000 hours of operation, whichever comes first. Contaminated or oxidized oil causes sluggish response or sticky pilot valve operation.
Mechanical Linkage Calibration
Ensure the mechanical linkage between the TG-13 terminal lever and the turbine steam valve moves smoothly without binding or excessive backlash. Adjust the linkage so that the governor can stroke the steam valve from fully closed to fully open within the active travel range of the governor terminal lever.
Frequently Asked Questions
Q: Can the TG-13 be converted to an electronic governor? A: The TG-13 is an entirely mechanical-hydraulic unit. While it cannot be digitally programmed directly, plants looking to transition to electronic control often upgrade to a Woodward TG-13E (which incorporates an electric actuator) or completely replace the unit with a ProAct or UG-style digital governor system.
Q: How do I adjust the speed setting on this governor? A: Speed can be adjusted manually via a screw on the governor casing or remotely via a pneumatic speed setting mechanism or small electric motor mounted to the top of the governor cover, depending on the specific option sub-code selected at the time of manufacturing.
Q: What causes the governor to hunt or oscillate? A: Speed hunting is usually caused by either air trapped in the internal hydraulic circuit, low oil levels, worn flyweight pins, or excessive friction/backlash in the external mechanical linkage connected to the steam valve. Ensure the oil level is correct and bleed any trapped air by cycling the governor terminal lever manually through its full stroke under low-load conditions.
