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Woodward 9905-669

Product Name:​ Woodward TM25LP Actuator (part of TM-25LP / TM-200LP series)
Product Introduction:​ The 9905-669 is the ordering part number for the Woodward TM25LP electro-hydraulic actuator. The TM-25LP and TM-200LP actuators are linear-stroke, current-driven actuators designed to position fuel valves, inlet valves, or other final control elements on turbines and engines. The TM25LP features a 25 mm available stroke, with a recommended stroke between no load and full load of 17 mm. The piston retracts toward the maximum position with current increase.
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Detailed content

Technical Specifications:
  • Product Name: TM25LP
  • Stroke: 25 mm available; recommended 17 mm between no-load and full-load
  • Actuator Electric Input Signal: 18 AWG wire (2 wires extend approx. 914 mm from opening)
  • Piston Motion: Retracts toward MAX position with increasing current
  • Conduit Connection: 0.500–14 (inch) NPTF rigid conduit connection
  • Certifications:
    • ATEX: LCIE 02 ATEX 6221 X, Zone 1, Category 2, Group II G, EEx e II T3 X
    • CSA: Certified for Class I, Division 1, Groups C & D; Class I, Division 2, Groups B, C & D (for use in Canada); Certificate LR 79726-4
    • UL: Listed for Class I, Division 1, Groups C and D; Class I, Division 2, Group B (for use in the United States); UL File E158654
  • Mechanical Interface: Orientation not important; 6× φ11.2 thru holes, 12.7 mm across flats
Functional Features:
  • Linear stroke actuator for precise valve positioning
  • Available in single-coil or dual-coil configurations
  • Optional LVDT position feedback sensors
  • Suitable for hazardous locations (explosion-proof variants available)
  • Compatible with Woodward 2301A and other governor controls
Material Composition & Structural Features:
  • Triple Coil Electro-hydraulic Servo Valve Assembly (in associated fuel valve systems)
  • LVDT Position Feedback Sensors (optional)
  • Trip Relay Valve Assembly
  • Hydraulic Filter Assembly
  • The actuator body is constructed for industrial hydraulic service with provisions for air bleed plugs
Application Scenarios:​ The TM25LP is used to drive fuel oil bypass valves, fuel oil stop valves, and other final control elements in turbine and engine fuel systems. Applicable in power generation, oil & gas, marine, and industrial process sectors where precise valve actuation is required.
Working Principle:​ The TM25LP is an electro-hydraulic actuator that converts an electrical control signal (current input) into linear mechanical motion. The current drives an electro-hydraulic servo valve assembly, which positions the piston. With increasing current, the piston retracts toward the maximum position. In dual-coil configurations, the actuator can be wired for fail-safe or redundant operation. LVDT feedback provides position verification to the control system.
Installation Requirements:
  • Install per Woodward TM-25LP / TM-200LP Actuator Manual (Manual CH82451)
  • For North American Class I, Division 1 or 2 installations, wiring must comply with the respective wiring methods
  • For European Zone 1 Category 2 installations, wiring must comply with Zone 1 – Category 2 method of protection
  • Ensure proper hydraulic fluid filtration per the hydraulic filter assembly specifications
  • Mount with orientation not critical, but ensure accessibility for maintenance and LVDT feedback calibration
Usage Precautions:
  • The actuator is part of a larger system that must include independent overspeed/over-pressure protection for the prime mover
  • Follow ESD precautions when handling associated electronic controls
  • Verify certification markings (CE, ATEX, CSA, UL) match the installation environment
  • Refer to the TM-25LP/TM-200LP operation manual for adjustment, maintenance, filter cleaning, and troubleshooting procedures
  • Unauthorized modifications outside specified mechanical, electrical, or operating limits will void certifications and warranty

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