WOODWARD 9908-359

الوصف

The WOODWARD 9908-359 is a specific configuration of a GS6 Gas Fuel Metering Valve. This valve is a crucial component designed for precise and reliable control of gaseous fuel flow, primarily in aeroderivative gas turbines.

WOODWARD 9908-359: GS6 Gas Fuel Metering Valve

The WOODWARD 9908-359 plays a vital role in a turbine’s fuel system. It’s engineered to accurately meter and control the flow of gaseous fuel into the combustion chamber, which is essential for efficient, stable, and environmentally compliant turbine operation.

Product Overview

This particular part number represents a specific variant within Woodward’s GS6 series of gas fuel metering valves. The GS6 valves are known for their compact size, fast response, and accuracy, making them ideal for aeroderivative gas turbines and other applications requiring dynamic fuel control.

• Product Type: Gas Fuel Metering Valve
• Manufacturer: Woodward
• Part Number: 9908-359
• Model Designation: GS6
• Key Specifications (based on Woodward’s product catalog and typical GS6 configurations for this P/N):
  • Port Size / Metering Area: The GS6 series offers various metering port areas, including 0.15 in² (97 mm²), 0.30 in² (194 mm²), 0.45 in² (290 mm²), 0.60 in² (387 mm²), and 0.75 in² (484 mm²). The 9908-359 specific configuration has a maximum geometric area which would be one of these.
  • Flange Type: Typically uses 1.5 inch SAE Code 61 Flanges, a common standard for fluid connections in industrial applications.
  • Body Material: While not explicitly stated for this exact part number, GS6 valves often feature robust construction materials to withstand the harsh turbine environment.
  • Input Voltage: 125 VDC.
  • Features: Includes a single prox switch.
  • Electrical Connections: Uses electrical connectors for wiring.
• Function: As an electrically actuated fuel valve with an on-board electronic positioner controller, it precisely controls the flow of gaseous fuel based on command signals from the turbine’s electronic control system. This ensures optimal fuel delivery for all phases of turbine operation, including start-up, acceleration, load changes, and steady-state running. The high accuracy and dynamic response are crucial for maintaining turbine performance and achieving low emissions (e.g., in Dry Low Emission – DLE – combustion systems).

Detailed Product Description

The Woodward 9908-359 GS6 Gas Fuel Metering Valve is engineered for high performance and exceptional reliability in demanding gas turbine applications. Key features common to the GS series, and thus found in this specific model, include:

• Integrated Electronic Position Controller: The valve incorporates an on-board electronic controller module. This enables precise and rapid positioning of the internal metering element in response to control signals, ensuring accurate fuel delivery and dynamic response. This integration simplifies system packaging and installation.
• Self-Cleaning, Shear-Type Metering Action: A hallmark of the GS series, this unique design actively cleans the metering port. This prevents performance degradation caused by deposits of gas condensates, contaminants, and system debris, which is crucial for extending operational periods between overhauls, especially with varied or less-than-ideal fuel gas quality.
• Single Moving Part Design: The valve’s design typically features a single moving part where the fuel-metering element, actuator rotor, and position feedback resolver are mounted on a single solid-piece shaft. This minimizes wear parts, greatly enhancing reliability and longevity.
• High Accuracy and Repeatability: By using a spherical fuel metering element with a precision-machined port and high-precision resolvers for position feedback, the valve achieves highly accurate and repeatable fuel flow control. This is vital for maintaining turbine speed, power output, and emissions compliance.
• Robust Shut-off Capability: The valve typically provides a positive flow shut-off.
• Wide Flow Range: Despite its compact size, the GS6 can handle a wide range of gas flow rates, from 4.5 to 6800 kg/h (10 to 15,000 lb/h), making it versatile for various turbine sizes within its operational range.

Technical Specifications (for the 9908-359 GS6)

Typical Applications

The WOODWARD 9908-359 GS6 Gas Fuel Metering Valve is commonly found in a variety of high-performance industrial applications where precise gas fuel control is critical:

• Aeroderivative Gas Turbines: Its primary application is in aeroderivative gas turbines for power generation, mechanical drive, or marine propulsion, where its fast response and compact design are highly beneficial.
• Small to Medium-Sized Industrial Gas Turbines: Used in other industrial gas turbine applications that fall within its flow and pressure ratings.
• Applications with Varied Fuel Gas Quality: The self-cleaning design makes it suitable for wellhead gas applications or where the fuel gas may contain contaminants.