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The WOODWARD 9904-825 is a mechanical-hydraulic speed droop governor specifically designed for steam turbines. It’s part of the TG-13L (Lever) series and is configured for high-speed applications, typically up to 6000 rpm. This model features counterclockwise (CCW) drive shaft rotation and is ATEX certified, making it suitable for hazardous environments.
WOODWARD 9904-825: Mechanical-Hydraulic Speed Droop Governor (TG-13L, 6000 rpm, CCW Rotation)
The WOODWARD 9904-825 is a robust, self-contained control device crucial for the reliable operation of small to medium-sized steam turbines. It’s particularly well-suited for applications where stable speed control with a defined droop characteristic is sufficient, rather than precise constant-speed (isochronous) operation. Its “Lever” designation indicates a specific mechanical interface for speed setting.
Product Overview
The 9904-825 operates as a mechanical-hydraulic governor. It continuously senses the turbine rotor speed and compares it to an internal setpoint. Based on this comparison, it precisely adjusts the turbine’s governor valve to regulate the inlet steam flow, thereby controlling the turbine’s speed.
- Product Type: Mechanical-Hydraulic Speed Droop Governor
- Manufacturer: Woodward
- Series: TG-13L (Lever-operated)
- Application: Small to medium steam turbines (e.g., driving pumps, compressors, generators).
- Key Feature: Speed droop control (not isochronous).
- Rated Speed: Designed for operation up to 6000 rpm.
- Speed Setting Mechanism: Lever-operated (manual adjustment).
- Drive Shaft Rotation: Counterclockwise (CCW) rotation.
- Output: 16 N·m (12 ft-lb) rotary output.
- Environmental Certification: ATEX certified (suitable for potentially explosive atmospheres).
- Rated Speed @ 2° Droop: 5860 rpm (a specific configuration point for droop).
Detailed Product Description
The WOODWARD 9904-825 provides a reliable and cost-effective solution for steam turbine speed control. It’s part of the well-established TG-13 governor series, offering specific configurations for different speed ranges and mechanical interfaces.
Here’s a breakdown of its features and how it functions:
- Mechanical-Hydraulic Operation: This governor is a self-contained unit. It senses turbine speed using an integrated driveshaft-driven ball head assembly. An internal, driveshaft-driven oil pump generates the necessary hydraulic pressure to create the force required to move and control the turbine’s governor valve. This mechanical-hydraulic design makes it inherently robust and minimizes reliance on external electronic components for its core speed sensing and actuation.
- Speed Droop Control: The 9904-825 operates on a speed droop principle. This means that as the load on the turbine increases, its speed will slightly decrease (or “droop”) proportionally. This characteristic is often desirable in applications where load sharing among multiple prime movers is needed, or where a slight, predictable speed variation under load changes is acceptable.
- Direct Turbine Connection: The governor directly couples to the steam turbine’s rotor or an auxiliary shaft to sense the turbine’s speed. Its rotary output terminal shaft directly connects to the turbine’s governor valve, precisely controlling the inlet steam flow.
- High-Speed Capability (6000 rpm): A key characteristic of the 9904-825 is its suitability for turbines operating at higher rotational speeds, up to 6000 rpm. This makes it ideal for a broader range of industrial steam turbine applications that demand faster rotational speeds.
- Lever-Operated Speed Setting: The “L” in TG-13L and the part number imply that the speed setpoint is adjusted via a mechanical lever. This provides a simple and direct method for operators to change the desired turbine speed.
- Counterclockwise (CCW) Rotation: The 9904-825 specifically features a counterclockwise drive shaft rotation and output shaft rotation. This is a critical mechanical specification for ensuring compatibility with the turbine’s interface.
- Rugged Construction and ATEX Certification: Built for demanding industrial environments, these governors feature robust construction and a self-contained sump. The ATEX certification confirms its suitability for use in potentially explosive atmospheres common in industries like oil & gas, petrochemical, and power generation.
- Output Work Capacity: The governor’s output terminal shaft delivers a significant 16 N·m (12 ft-lb) of rotary work capacity, which is sufficient to operate various turbine governor valves.
In essence, the 9904-825 provides a reliable, robust, and cost-effective solution for steam turbine speed control, particularly for high-speed applications where a mechanical-hydraulic, lever-operated governor with counterclockwise rotation is required.
Technical Specifications (General)
| Parameter | Value |
| Product Type | Mechanical-Hydraulic Governor |
| Manufacturer | Woodward |
| Part Number | 9904-825 |
| Series | TG-13L (Lever-operated) |
| Control Mode | Speed Droop Control |
| Nominal Speed | 6000 rpm (designed for applications up to this speed) |
| Rated Speed @ 2° Droop | 5860 rpm |
| Speed Setting Method | Lever-operated |
| Drive Shaft Rotation | Counterclockwise (CCW) |
| Output Torque | 16 N·m (12 ft-lb) rotary output |
| Output Terminal Shaft | Counterclockwise rotation |
| Power Source | Self-contained (driven by turbine shaft, internal oil pump) |
| Environmental Cert. | ATEX certified |
| Construction | Robust, weatherproof, self-contained sump |
| Applications | Steam turbines driving pumps, compressors, generators |
| Reference | Woodward documentation for TG-13L series governors (e.g., Industrial Products Catalog 25182) |
Typical Applications
The WOODWARD 9904-825 is primarily used in industrial settings that employ small to medium steam turbines for mechanical drive or power generation, especially where:
- High Speeds are Present: Turbines operating at or around 6000 rpm.
- Speed Droop Control is Desired: For load sharing or applications tolerant of slight speed variation with load changes.
- Mechanical-Hydraulic Simplicity: A preference for a self-contained, robust mechanical governor over electronic systems.
- Lever-Based Speed Adjustment: Where operators manually adjust the speed setpoint via a lever.
- Counterclockwise Rotation: Where the turbine’s mechanical drive interface requires CCW rotation for the governor.
- Common Applications:
- Pumps: Controlling steam turbines that drive process pumps.
- Compressors/Turboexpanders: Regulating the speed of steam turbines used to drive compressors.
- Generators: Controlling the speed of steam turbines connected to generators for power generation.
- Fans: Managing steam turbines that power large industrial fans.
