1. Product Description

9907-1213 is Woodward TM25 low-pressure linear proportional actuator, a field execution device for engine/gas turbine speed governing and fuel valve control, matched with Woodward MicroNet Plus control rack (5466-1045 CPU, 5501-432 actuator drive card). It adopts built-in AC LVDT full stroke position feedback, internal return spring for fail-safe shutdown when power lost, female threaded output rod for mechanical linkage to fuel rack or throttle valve. Die-cast aluminum housing with IP54 dust/water splash protection, designed for harsh power plant, marine and oil & gas environments, fully compliant with CE EMC anti-electromagnetic interference standards.

• Part Number: 9907-1213, Series: TM25 LP Low Pressure Extend Type
• Output Shaft: Female internal thread, extend stroke movement
• Feedback: Built-in AC LVDT position sensor, full stroke real-time position signal
• Fail-Safe Mechanism: Internal compression spring, auto retract to minimum fuel position on power loss
• Actuator Drive Signal: 0–200mA PWM current signal from control card 5501-432
• Operating Temperature: -30℃ ~ +75℃; Storage: -40℃ ~ +85℃
• Protection Grade: IP54, anti-oil mist, dust and light water spray
• Mechanical Precision: Linear error ≤0.5% FS, repeat positioning ≤±0.2% FS
• Shock & Vibration: IEC 60068-2-6 certified for 5–500Hz continuous vibration

• Cable Outlet: Integrated sealed shielded multi-core cable, single-point shield grounding required

  
  

2. Core Product Functions

1. Proportional fuel valve linear drive: Receive 0–200mA control current from Woodward actuator control module 5501-432, convert current signal into precise linear push-pull displacement to adjust engine fuel rack, gas turbine fuel control valve opening.
2. Closed-loop position feedback via LVDT: Built-in LVDT transmits real-time valve stroke position back to rack control card, forming full closed-loop PID regulation to eliminate position drift and hunting fluctuation during unit load change.
3. Power-fail safety reset protection: When control power cuts off suddenly, internal high-strength spring automatically pulls the shaft back to minimum fuel position to shut down prime mover and avoid overspeed risk.
4. Strong anti-interference field operation: Fully shielded housing and shielded signal cable design, suppress EMI interference from high-current motors, inverters and high-voltage cabinets in power station sites.
5. Uniform load sharing for parallel gensets: Cooperate with Woodward 2301A / 9907 series load-sharing controllers to realize balanced power distribution for multiple parallel generator sets.
6. Wide environmental adaptability: Stable operation under high humidity, salt fog, high temperature and vibration conditions for marine, offshore and heavy industrial prime movers.

3. Application Scenarios

• Industrial gas turbine & steam turbine power plants: Fuel control valve execution device matched with MicroNet Plus control system (5466-1045 CPU, 5464-658 speed module)
• Diesel generator sets, distributed standby power stations and combined cycle auxiliary units: Speed governing fuel rack actuator
• Offshore oil & gas platforms, marine ship power generation systems: Salt fog resistant prime mover throttle control
• Petrochemical plant compressors, blowers and process engines: Anti-surge valve and fuel proportional adjustment
• Coal-fired auxiliary boiler, waste incineration power generation unit combustion control actuator
• Cooperate with Bently 3500 vibration monitoring system and GE Mark VIe DCS for full unit integrated control

4. Common Typical Issues & Root Causes