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The Woodward 8235-402 is a specific part number for a Flo-Tech™ Integrated Throttle Body (ITB) and Actuator. This means it’s an all-in-one unit designed to precisely control air or fuel flow to an engine.
WOODWARD 8235-402: Flo-Tech™ Integrated Throttle Body (ITB) and Actuator
The Woodward 8235-402 is a highly integrated component that combines an electric actuator and a throttle body into a single, compact unit. It’s part of the Flo-Tech™ family, which is engineered for precise flow control in engine applications.
Product Overview
- Product Type: Integrated Throttle Body (ITB) and Electric Actuator
- Manufacturer: Woodward
- Series: Flo-Tech™ ITB
- Function: Electronically controls the flow of air or fuel (gaseous media) to a prime mover (engine) by precisely adjusting the throttle plate position. This enables accurate speed control, air/fuel ratio management, and emissions compliance.
- Key Feature: Flo-Tech ITBs are designed with flow shaping to enhance engine idle stability. They provide equivalent maximum flow rates to standard butterfly throttle bodies of the same diameter, but with integrated electronic control.
- Safety: The system contains a return spring to ensure it returns to a fail-safe position (e.g., minimum fuel or air) upon loss of power or signal, complying with safety specifications like DOT 571.124.
- Input: Flo-Tech ITBs typically accept various command input options, such as PWM, 0–5 Vdc, 4–20 mA, and 0–200 mA.
- Power Supply: Requires a DC power supply, often in the range of 9–32 Vdc, capable of supplying a sustained 25 watts at steady-state and 50 watts for transient conditions (for at least 0.25 seconds).
Detailed Description
The Woodward Flo-Tech ITBs, including the 8235-402, offer a modern and integrated solution for controlling engine air or gaseous fuel flow. By combining the actuator and throttle body, they simplify installation and provide a highly responsive and accurate control element.
Key characteristics of the 8235-402:
- Integrated Design: This unit consolidates the electric actuator and the throttle body, streamlining installation and reducing complexity compared to separate components with mechanical linkages.
- Precise Flow Control: The throttle plate’s position is precisely controlled in proportion to the command signal, allowing for accurate modulation of air or fuel flow to meet engine control demands.
- Flow Shaping: A unique design feature of the Flo-Tech family that optimizes flow characteristics, particularly improving engine idle stability through refined control at low flow rates.
- Versatile Inputs: With support for various analog and digital input signals (PWM, 0–5 Vdc, 4–20 mA, 0–200 mA), it can seamlessly integrate with diverse electronic control modules (ECMs) and system architectures.
- Position Feedback: The unit typically provides a position feedback signal (ranging from 0.5 V to 4.5 Vdc) that indicates the actual throttle plate position. This allows the main engine controller to monitor and verify its operation.
- Robust Construction: Engineered for durability, it’s built to withstand the demanding conditions of engine applications, including vibrations, extreme temperatures (-40 to +105 °C operating range), and environmental exposure.
- Throttle Body Size: While the specific bore size for the 8235-402 isn’t always individually detailed in general overviews, the Flo-Tech ITB family is available in various bore sizes (e.g., 33 mm, 48 mm, 60 mm, 68 mm, and 75 mm). The “-402” suffix denotes a particular configuration within this series.
Applications
The Woodward 8235-402 is widely used in engines where precise control of air or gaseous fuel flow is critical for performance, efficiency, and emissions:
- Gaseous Fuel Engines: Particularly for engines running on natural gas, CNG, LNG, or biogas, where precise air/fuel ratio control is essential for optimal combustion and meeting emission standards.
- Emissions Control Systems: A key component in systems designed to achieve and maintain stringent exhaust emission regulations.
- Industrial Power Generation: Employed in engine-driven generator sets to precisely control load response and maintain stable electrical frequency.
- Engine Bench Testing: Used in development and testing environments where highly repeatable and accurate control of air/fuel intake is required.
- Modernization Projects: Ideal for directly replacing older, manual throttle bodies, upgrading systems to electronic control without requiring extensive redesign of linkages or separate actuator mounting.
Related Products/Series
The 8235-series belongs to Woodward’s broader Flo-Tech and ProAct families of actuators and integrated control devices. Other related part numbers might include:
- 8235-xxx (other Flo-Tech ITBs): The Flo-Tech ITB family includes various models with different bore sizes and specific features, such as 8235-147, 8235-185, 8235-398, 8235-399, 8235-400, 8235-404, 8235-406.
- ProAct Controllers: While the 8235-402 has an integrated actuator, it requires a higher-level electronic control module (such as a ProAct Speed Control or an Air/Fuel Ratio Control) to send the command signals that dictate its position.
