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The WOODWARD 9907-894 is a specific configuration of a GSOV25 Gas Shutoff Valve. This valve is a crucial safety component designed for industrial gas turbines, used to rapidly and reliably stop the flow of gaseous fuel to the turbine.
WOODWARD 9907-894: GSOV25 Gas Shutoff Valve
The WOODWARD 9907-894 is an essential part of a turbine’s fuel system, providing a fast and secure means to shut off gaseous fuel flow in emergency situations or during normal shutdown sequences. Its robust design ensures high reliability in demanding industrial environments.
Product Overview
This particular part number represents a specific variant within Woodward’s GSOV25 series of gas fuel shutoff valves. The GSOV25 valves are generally smaller than the GSOV80 series but are still built for high-pressure, high-flow applications typical of many industrial gas turbines.
- Product Type: Gas Fuel Shutoff Valve
- Manufacturer: Woodward
- Part Number: 9907-894
- Model Designation: GSOV25
- Key Specifications (based on typical GSOV25 configurations for this P/N):
- Input Voltage: 125 VDC.
- Features: Includes an open position switch, providing feedback to the control system that the valve is fully open.
- Temperature Rating: Designed for High Temperature (HT) operation, meaning it can withstand elevated fuel or ambient temperatures common in turbine environments. This typically covers gas temperatures between –20 and +177 °C (–4 and +350 °F).
- Body Material: Features all stainless steel construction, ensuring excellent corrosion resistance and durability in challenging service conditions.
- Operating Pressure: Rated for pressures up to 900 psia (6.2 MPa).
- Closing Time: Extremely fast, typically less than 0.100 seconds after the electrical current signal to the solenoid is interrupted.
- Shutoff Capability: Provides better than Class VI shutoff, meaning very minimal leakage from inlet to outlet when closed.
- Function: The GSOV25 valve acts as a positive shutoff device. When commanded by the turbine’s control system (or in the event of a safety trip), it rapidly de-energizes its solenoid. This action causes a spring-loaded piston to quickly force the main piston to its seal, instantly halting the flow of gaseous fuel to the turbine. This rapid closure is vital for safe shutdown, preventing overspeed, or addressing other critical abnormal operating conditions.
Detailed Product Description
The Woodward 9907-894 GSOV25 Gas Fuel Shutoff Valve is engineered for safety and reliability in demanding gas turbine applications. Key features common to the GSOV25 series that apply to this model include:
- Positive, High-Class Shutoff: Provides an exceptionally tight, leak-free seal when closed, exceeding Class VI shutoff standards. This ensures complete and reliable isolation of the fuel supply, which is paramount for operational safety.
- Extremely Fast Acting: Engineered for rapid closure (under 100 milliseconds), allowing for quick response to emergency conditions and minimizing potential damage or hazardous situations.
- High Pressure Capability: Built to withstand and operate reliably under the high pressures associated with gaseous fuel delivery in industrial turbines, up to 900 psia (6.2 MPa).
- Robust Stainless Steel Construction: The all-stainless steel body ensures superior corrosion resistance and durability, making it suitable for a wide range of gaseous fuels, including those with potential contaminants, and for harsh operating environments.
- Open Position Switch for Feedback: The integrated open position switch provides crucial electrical feedback to the turbine control system, confirming the valve’s status for safe operation, diagnostics, and sequence control.
- High Temperature Operation: The “HT” version signifies its capability to operate reliably at elevated fuel and ambient temperatures, extending its applicability to various turbine designs and operating conditions.
- Minimal Pressure Drop: The valve’s design often features a straight-through flow path to minimize pressure drop across the valve when open, which contributes to lower gas compression operating costs. Critical moving parts and seals are typically kept out of the main flow stream to reduce wear and extend life.
- Self-Contained Operation: Can operate from line pressure, requiring no external pilot pressure connections.
Technical Specifications (for the 9907-894 GSOV25)
Typical Applications
The WOODWARD 9907-894 GSOV25 Gas Fuel Shutoff Valve is commonly found in safety-critical roles within:
- Industrial Gas Turbine Power Generation: Used in power plants to ensure the rapid and safe shutdown of gas turbines, especially those in the 10 to 50 MW range.
- Oil & Gas Industry: Employed in gas turbines driving compressors or pumps in pipelines, processing facilities, and offshore platforms, where emergency fuel cutoff is vital, particularly in environments with high temperatures or corrosive elements.
- Industrial Cogeneration Plants: Part of the safety system for gas turbines used in combined heat and power applications.
- Any application requiring fast and reliable gaseous fuel isolation for safety or operational control.
