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The WOODWARD 9905-658 is an actuator, specifically a TM-25LP (Low Pressure) Linear Actuator.
WOODWARD 9905-658: TM-25LP Linear Actuator
The WOODWARD 9905-658 is a precise and robust actuator designed for industrial prime mover applications. It plays a crucial role in converting control signals from a governor or control system into accurate mechanical motion to regulate engines or turbines.
Product Overview
This part number designates a specific configuration within Woodward’s highly regarded TM (Turbine/Engine Master) series of actuators, specifically the TM-25LP variant.
- Product Type: Linear Actuator
- Manufacturer: Woodward
- Part Number: 9905-658
- Model Designation: TM-25LP
- Key Features (based on typical TM-25LP configurations):
- LP (Low Pressure): This indicates it operates with a lower hydraulic or pneumatic supply pressure compared to high-pressure versions. This is beneficial in systems where high-pressure fluid isn’t readily available or desired, offering more versatile application.
- Dual Coil: This suggests the actuator uses two coils for its operation, which can be for redundancy, improved control, or specific control strategies.
- “Extends w/o Feedback”: This crucial detail (often found in Woodward’s catalog for this part number) means the actuator’s shaft extends as its default or desired movement, and this specific configuration does not include an internal position feedback device (like an LVDT). This implies that the position feedback would need to be provided by an external device if closed-loop position control is required by the control system.
- Function: Translates a control signal (typically a hydraulic or pneumatic pressure signal, or an electrical signal to an internal solenoid if applicable) into precise linear force and displacement. This mechanical output is used to operate fuel racks, valve linkages, or other control surfaces on engines, turbines, or other industrial machinery.
Detailed Product Description
The Woodward TM-25LP Actuator is engineered for reliable and precise performance in demanding industrial environments. The TM series is known for its durability and adaptability across various power generation and industrial control applications.
- Hydraulic or Pneumatic Operation: TM actuators typically operate using either hydraulic fluid or pneumatic pressure as the working medium, depending on the specific model and system design. The “LP” designation highlights its suitability for lower supply pressures.
- Precision and Repeatability: These actuators are designed to provide highly accurate and repeatable positioning. This precision is vital for maintaining stable speed, load, or other critical parameters for engines and turbines.
- Robust Construction: Built to withstand harsh industrial conditions, including significant vibrations, wide temperature fluctuations, and continuous duty cycles. Woodward actuators are known for their robust design and long service life.
- Linear Motion Output: The actuator provides a linear force and stroke, meaning its output shaft moves in a straight line, directly connecting to and operating control linkages.
- Absence of Internal Feedback: The “w/o Feedback” specification for this particular part number (9905-658) is important for system design. If the control system requires precise knowledge of the actuator’s position, an external position sensor (like a linear variable differential transformer – LVDT, or a rotary potentiometer linked to the shaft) would be necessary. This contrasts with other TM-25LP variants that might include integrated feedback (e.g., 9905-657, which “Retracts w/ LVDT”).
Technical Specifications (General for TM-25LP Actuators, specific details for 9905-658)
Typical Applications
The WOODWARD 9905-658 TM-25LP Linear Actuator is commonly found in a variety of industrial applications that require reliable and precise mechanical control, particularly where external feedback can be provided or where absolute position feedback is not critical:
- Diesel and Gas Engines: For accurate control of fuel injection systems, throttle bodies, or air dampers to maintain desired engine speed and load. The “LP” feature is useful where lower pressure hydraulic systems are available.
- Small to Medium Steam Turbines: For actuating steam admission valves, regulating steam flow to control turbine speed and power output.
- Compressors and Pumps: Used in systems where precise flow or pressure regulation is achieved by adjusting heavy-duty valves or dampers.
- Industrial Machinery: In processes where direct mechanical control from a governor or control system is needed, especially if the controller is handling position feedback externally.
