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The Woodward 8407-604 is a specific part number for a TecJet™ 52 Gaseous Fuel Metering Valve. It’s an integrated, digitally-compensated control valve and actuator system designed for precise fuel flow regulation in natural gas and dual-fuel engines.
WOODWARD 8407-604: TecJet™ 52 Gaseous Fuel Metering Valve
The Woodward 8407-604 is a sophisticated, all-in-one component that combines a fuel valve and its electronic actuator. It is part of the TecJet™ 52 series, highly regarded for its accuracy and responsiveness in managing gaseous fuel delivery to engines.
Product Overview
- Product Type: Gaseous Fuel Metering Valve / Integrated Valve and Actuator
- Manufacturer: Woodward
- Series: TecJet™ 52
- Function: Precisely controls the mass flow rate of gaseous fuels (like natural gas, biogas, LPG, or even low-BTU specialty gases) to an internal combustion engine. It receives a fuel rate demand signal from a main engine control system and accurately adjusts its internal valve position to deliver the exact required flow.
- Key Features:
- Integrated Design: Combines the valve and the electronic actuator into a single unit, simplifying installation, reducing wiring complexity, and enhancing reliability.
- Digital Compensation: Features onboard electronics that automatically compensate for variations in gas pressure and temperature. This ensures accurate mass flow metering of fuel regardless of fluctuating gas supply conditions, which is crucial for optimal engine performance, efficiency, and emissions control.
- High Response: Engineered for fast and precise adjustments to fuel flow commands, allowing the engine to accept large load steps without losing speed.
- Feedback Sensors: Incorporates internal sensors to continuously monitor critical parameters such as fuel pressure, temperature, and valve pressure differential. This data is used for internal control loops and can be communicated to the main engine controller.
- High Turn-down Ratio: This allows one TecJet model to be used across a wide range of fuel flow requirements and potentially for a complete engine family.
- Valve Size: The “52” in TecJet 52 indicates a nominal valve size of 52 mm.
- Input Voltage Range: 18–32 Vdc.
- Weight: Approximately 14.7 kg (32.5 lb).
- Valve Maximum Geometric Area: 1310 mm² (2.03 in²).
Detailed Description
The Woodward TecJet™ 52 valve, including the 8407-604, is a vital component for modern gaseous and dual-fuel engines. It enables them to operate efficiently, with high performance, and meet increasingly stringent emission standards.
Key characteristics of the 8407-604:
- Precise Fuel Metering: The valve dynamically adjusts fuel flow based on real-time engine load and speed demands. By accurately controlling the fuel quantity, it helps maintain the optimal air/fuel ratio for efficient combustion, which minimizes fuel consumption and reduces harmful emissions.
- Closed-Loop Control: The integrated electronics and sophisticated control algorithms, coupled with internal feedback sensors, allow for precise closed-loop control of fuel delivery. This provides excellent accuracy, stability, and repeatability, crucial for consistent engine operation.
- Robust Construction: Built to endure the demanding conditions of engine environments, including high levels of vibration, wide operating temperature extremes (typically -20 to +85 °C for steady state ambient), and continuous exposure to various gaseous fuels.
- Communication Protocol: While the exact protocol for the 8407-604 isn’t explicitly detailed in the provided search snippets, TecJet 52 valves generally communicate via a CAN link (Controller Area Network) to a separate engine control system. Historically, specific part numbers were tied to certain protocols (like EGS-01, EGS-02/E6, GECM, or CANopen). To confirm the exact protocol for the 8407-604, you would typically need to consult Woodward’s specific product documentation for this part number.
- RoHS Compliance: The 8407-604 is likely a non-RoHS compliant version. Woodward has been transitioning these to RoHS compliant (Generation 2) variants, which are generally 100% backward compatible. Non-RoHS versions are facing inactivation due to declining demand and regulatory requirements.
Applications
The Woodward 8407-604 TecJet™ 52 valve is widely applied in various engine systems that run on gaseous fuels:
- Natural Gas Engines: Used on four-cycle, turbocharged engines for power generation (generator sets), marine propulsion, and industrial applications.
- Dual-Fuel Engines: Where engines can switch between or combine liquid and gaseous fuels.
- CHP (Combined Heat and Power) Plants: Ensuring efficient and clean operation of gas engines that provide both electricity and heat.
- Compressor Stations: For gas engines driving compressors in pipeline and industrial processing applications.
Compatibility and Replacement Notes
When dealing with TecJet 52 valves, it’s vital to consider:
- Generation and RoHS: The 8407-604 is likely a non-RoHS Gen 1 TecJet 52. Woodward’s newer TecJet 52 (Generation 2) RoHS variants are designed to be 100% compatible. If you need to replace an 8407-604, it’s highly recommended to consider the newer RoHS-compliant equivalent, if available, as the non-RoHS versions are being phased out (with inactivation dates as early as December 2023 for some related parts).
- Protocol Match: The primary consideration for replacement is always the communication protocol used by your engine’s main control system. Ensure the replacement TecJet valve supports the identical protocol as the existing one.
- Flow Testing: Newer Gen II TecJet valves are designed to be “drop-in replacements,” and flow testing is often performed during manufacturing to ensure the engine does not need to be recalibrated when previous models are replaced.
