WOODWARD 9904-817

الوصف

The WOODWARD 9904-817 is a mechanical-hydraulic speed droop governor designed specifically for steam turbines. It’s part of the TG-13L (Lever) series and is known for its ability to handle higher speed applications, typically up to 4000 rpm.

WOODWARD 9904-817: Mechanical-Hydraulic Speed Droop Governor (TG-13L, 4000 rpm)

The WOODWARD 9904-817 is a robust, self-contained control device crucial for the reliable operation of small to medium-sized steam turbines, particularly where precise, constant-speed (isochronous) operation isn’t the primary requirement, but rather stable speed control with a defined droop characteristic. Its “Lever” designation suggests a specific mechanical interface for speed setting.

Product Overview

The 9904-817 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 4000 rpm.
• Speed Setting Mechanism: Lever-operated.
• Drive Shaft Rotation: Specific rotation (check datasheet for exact direction, typically CW or CCW).
• Output: 16 N·m (12 ft-lb) rotary output.
• Environmental Certification: Often designed for hazardous locations (HAZLOC) and ATEX certified, depending on the exact build.

Detailed Product Description

The WOODWARD 9904-817 provides a reliable and cost-effective solution for steam turbine speed control. It’s often referenced in the context of the long-standing and widely used TG-13 governor series, offering similar core functionality but tailored for specific 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 9904-817 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.
• Higher Speed Capability (4000 rpm): A key characteristic of the 9904-817 (and other 9904-81x variants designed for 4000 rpm) is its suitability for turbines operating at higher rotational speeds compared to, for example, the 2400 rpm variants (like 9904-814, -815, -816). This makes it ideal for a broader range of industrial steam turbine applications.
• 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.
• Rugged Construction and Certifications: Built for harsh industrial environments, these governors feature robust construction and a self-contained sump. Many variants in this series are ATEX certified, making them suitable for use in potentially explosive atmospheres common in oil & gas, petrochemical, and power generation industries.
• 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.

The 9904-817 provides a reliable and cost-effective solution for applications where a robust, self-contained mechanical-hydraulic governor with speed droop characteristics, a lever-operated speed setting, and suitability for 4000 rpm is required for steam turbine control.

Technical Specifications (General)

Typical Applications

The WOODWARD 9904-817 is primarily used in industrial settings that employ small to medium steam turbines for mechanical drive or power generation, especially where:

• Higher Speeds are Present: Turbines operating at or around 4000 rpm.
• Speed Droop Control is Desired: For load sharing or applications tolerant of slight speed variation with load changes.
• Mechanical-Hydraulic Simplicity: 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.
• Applications include:
  • 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.