Woodward C8251-758 Proportional Actuator

• Brand
  Woodward
• Model
  C8251-758
• Product Name
  UG‑ACT Electro‑Hydraulic Proportional Actuator
• Place of Origin
  United States
• HS Code
  84122100
• Dimensions
  263 mm × 58 mm × 28 mm
• Weight
  4.3 kg
• Operating Temperature
  ‑20 °C ~ +70 °C
• Storage Temperature
  ‑40 °C ~ +85 °C
• Power Supply
  24VDC
• Warranty
  12 month
• Product Status
  New and original

Backed by abundant in-stock inventory and nearly 20 years of industry experience, our company stands as a leading player in the industrial control sector.We offer an extensive range of industrial control products covering numerous models. Should you have any other requirements, please feel free to contact us, and we will respond to you promptly.

Our main brand:

1.ABB's module cards, touch screens, controllers, etc., such as PP846 touch screen, IGCT starting with 5SHY, PM starting controller, AI, DO starting input/output module, SP starting Bailey module, etc

2.GE's module card CPUs, such as VMIC starter, IS200, IS215, IS400, IS420 series, etc,

3.Emerson's card components and EPRO probes, Westinghouse 1C series, Honeywell CC series, Schneider 140 series, Envision full series, Bentley 3500 series, Rexroth motors and drives, and Foxboro small modules.

Input Signal: Accepts 20-160 mA proportional current command signal transmitted from compatible Woodward electronic governor control systems. This analog current input serves as the primary setpoint reference, converting electrical control instructions into precise mechanical actuator displacement for prime mover regulation.

Power Input: Features a fully self-contained internal oil sump design, eliminating the requirement for external customer-supplied hydraulic oil supply lines and auxiliary hydraulic power units. All hydraulic working fluid is stored and circulated within the actuator housing for simplified field installation and system integration.

Feedback Input: Equipped with a built-in integral magnetic pickup position sensor, delivering real-time closed-loop shaft position feedback back to the governing controller. This position feedback signal enables high-accuracy positioning, fast response, and stable closed-loop control performance under varying engine or turbine operating conditions.

Rotary Mechanical Output: Delivers a total 42-degree full-range rotary travel on the output shaft. The defined angular stroke covers the complete operating span for fuel adjustment, from minimum fuel position up to maximum fuel demand position during normal governing operations.

Output Work Capacity: Provides 20 J (15 ft-lb) rated torque output. Sufficient mechanical work capacity to overcome linkage friction, spring preload, and dynamic load disturbances present on typical fuel rack and governor mechanical linkages.

Application Output: Heavy-duty rotary shaft output mechanically coupled to engine fuel racks or turbine governor linkages. Converts electrical governor command signals into physical fuel metering movement to regulate engine speed, load output, and overall prime-mover operational performance.

The Woodward C8251-758 UG-ACT functions as a self-contained proportional electro-hydraulic rotary actuator engineered for prime-mover speed and load governing. It translates analog current command signals supplied by compatible Woodward electronic governor units into precise rotary shaft displacement, which directly manipulates engine fuel racks or turbine governing linkages for fuel regulation.

A 20-160 mA proportional current command originating from the external governing controller drives the internal torque motor assembly. Output torque generated by the torque motor varies proportionally with incoming current magnitude, acting directly on the servo-plunger pilot valve. This pilot valve precisely regulates pressurized hydraulic fluid drawn from the actuator’s integrated internal oil sump toward the main hydraulic power piston; no separate external hydraulic power source or supply piping is required. Hydraulic force exerted on the power piston generates high-torque rotary motion of the output shaft across its full 42-degree angular operating range.

A built-in magnetic-pickup position sensor continuously captures real-time angular position of the output shaft. This position feedback signal is fed both to the actuator’s on-board closed-loop control logic and back to the host electronic governor. The control circuit continuously compares actual shaft position against the target position defined by the 20-160 mA incoming command. Any detected position offset triggers corrective adjustments to the torque motor and pilot valve assembly, continuing actuation until measured shaft position fully matches the commanded setpoint.

Internal hydraulic power amplification delivers ample output torque to overcome mechanical resistance including linkage friction, spring pre-loading and transient dynamic loads present on typical fuel control linkages. Variations in input command current produce proportional modulation of output-shaft angle, adjusting fuel metering to stabilize prime-mover rotational speed and handle fluctuating load conditions. Under signal loss or internal fault scenarios, integrated hydraulic spring hardware automatically returns the output shaft to the minimum-fuel position, implementing critical fail-safe shutdown protection for the connected engine or turbine equipment.

Frequently Asked Questions (FAQ)

1.How fast will you reply to my inquiry?

We process all inquiries efficiently and will respond promptly once we receive your message.

2.Do you carry large inventory of industrial control parts?

We maintain massive ready stock of mainstream automation spare parts to shorten lead times.

3.Can you source discontinued or obsolete PLC & DCS modules?

Absolutely.
We specialize in sourcing hard-to-find, obsolete and out-of-production industrial control components.

4.Do you inspect goods before shipment?

Every product undergoes thorough inspection before packing and dispatch.

5.Can you ship orders worldwide?

We provide global shipping with flexible logistics for urgent and regular orders.

6.What payment methods are available?

We accept multiple secure payment options. Please contact our sales team for detailed terms