WOODWARD 8235-249

الوصف

The Woodward 8235-249 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 8235-249: Flo-Tech™ Integrated Throttle Body (ITB) and Actuator

The Woodward 8235-249 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 can 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 sustained power (e.g., 25 watts steady-state, 50 watts transient).

Detailed Description

The Woodward Flo-Tech ITBs, including the 8235-249, 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 8235-249:

• Integrated Design: Unlike traditional setups that require a separate actuator and throttle linkage, the 8235-249 is a single unit. This reduces complexity, minimizes potential failure points, and offers a more compact footprint.
• Precise Flow Control: The throttle position is proportional to the command signal it receives. This allows for very accurate modulation of flow based on engine control demands.
• Flow Shaping: The unique design of the Flo-Tech family helps to optimize flow characteristics, particularly benefiting engine idle stability by providing precise control even at low flow rates.
• Versatile Inputs: The ability to accept various analog and digital input signals (PWM, voltage, current) makes it highly adaptable to different electronic control modules (ECMs) and system architectures.
• Position Feedback: These units typically provide a position feedback signal (e.g., 0.5 V to 4.5 V) that indicates the actual position of the throttle plate, allowing the main engine controller to monitor and verify its operation.
• Robust Construction: Designed to withstand the demanding conditions of engine applications, including vibrations, temperature extremes, and environmental exposure.
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Applications

The Woodward 8235-249 is widely used in engines where precise control of air or gaseous fuel flow is critical for performance, efficiency, and emissions:

• Gaseous Fuel Engines: Especially for natural gas, CNG, LNG, or biogas engines, where precise air/fuel ratio control is essential for optimal combustion and emissions compliance.
• Emissions Control Systems: As a key component in systems designed to meet stringent exhaust emission regulations.
• Industrial Power Generation: In engine-driven generator sets to precisely control load response and maintain stable electrical frequency.
• Engine Bench Testing: For development and testing applications where highly repeatable and accurate control of air/fuel intake is required.
• Direct Replacement: Designed for direct replacement of manual throttle bodies, upgrading systems to electronic control without extensive re-engineering.

Related Products/Series

The 8235-series is part of Woodward’s broader ProAct and Flo-Tech 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 bore sizes (e.g., 33 mm, 48 mm, 60 mm, 68 mm, 75 mm, 107 mm, 120 mm, 135 mm). The specific “249” suffix would denote a particular configuration or bore size within this range.
• 8235-399: Another Flo-Tech ITB in the same series, likely with a different bore size or specific feature set.
• ProAct Controllers: While the ITB has an integrated actuator, it still requires a higher-level electronic control module (like a ProAct Speed Control or Air/Fuel Ratio Control) to send the command signals.