Woodward 8405-809 ProAct 75 Series Electric Valve Actuator

Overview

The 8405-809 electric actuator from Woodward belongs to the ProAct™ 75 Series and is engineered for precise rotary control of butterfly valves used in diesel and gas engine systems. Designed as a fully electric solution, it replaces hydraulic or pneumatic actuation, simplifying system architecture while improving response accuracy and long-term reliability.

This actuator delivers bidirectional rotary motion with high torque density, making it suitable for throttle, air, or bypass valve control under rapidly changing load conditions.

Functional Characteristics

The 8405-809 provides closed-loop electric actuation optimized for engine air and fuel management. Its internal motor and feedback design ensure stable valve positioning even during transient events such as load acceptance, shedding, or parallel operation.

The actuator is intended to operate with external electronic governors rather than as a standalone controller, forming part of a coordinated engine control system.

Technical Specifications

• Manufacturer: Woodward
• Model / Part Number: 8405-809
• Product Family: ProAct™ 75 Series
• Actuator Type: Electric rotary valve actuator
• Control Function: Butterfly valve positioning for air, fuel, or bypass flow
• Motion: Bidirectional rotary output
• Power Supply: DC input (system-dependent, typically 24 VDC)
• Position Feedback: Integrated internal feedback (potentiometric or resolver-based depending on revision)
• Control Interface: Analog or digital command via compatible Woodward governor (no native Ethernet interface on actuator itself)
• Mechanical Construction: Compact aluminum housing, industrial-grade sealing
• Installation Orientation: Shaft-coupled butterfly valve mounting
• Environmental Rating: Designed for engine-mounted industrial environments

System Compatibility

The 8405-809 is designed to work in conjunction with Woodward engine controllers and governors, including but not limited to:

• 2301D Digital Speed and Load Controllers
• ProAct™ governor systems
• 723PLUS Digital Control platforms

It relies on the governor for command logic, speed control algorithms, and load management functions.

Application Scenarios

This actuator is commonly deployed in:

• Engine-driven generator sets
• Marine propulsion and auxiliary engines
• Industrial gas and diesel engines
• Compressor and pump drive systems
• Small turbine auxiliary valve control

Its electric-only architecture is especially advantageous in installations where hydraulic infrastructure is undesirable or impractical.

FAQ

Is the 8405-809 a standalone controller?

No. The 8405-809 is an actuator only. It requires an external electronic governor or controller to generate position commands and manage control logic.

Does this actuator communicate directly via Ethernet?

No. Communication is handled by the connected Woodward governor or control system. The actuator itself operates through electrical command and feedback signals.

What type of valves is it designed for?

It is optimized for butterfly valves used in throttle, air intake, exhaust bypass, or similar flow control applications.