Description
WOODWARD 9907-1213
I. Basic Information
Model: 9907-1213Brand: WOODWARDProduct Type: TM25 low-pressure linear fuel actuator, extend type with female shaft. It is the core executive component of speed control system for generator sets and steam turbines, which receives proportional current signal from governor to adjust fuel valve opening and realize closed-loop control of engine speed and output power.Compatible Platform: Matches Woodward 2301A, 505, 505E and other series governors, widely applied in diesel/gas generator sets, small steam turbines and compressor units.
Product Positioning
9907-1213 is a TM25 low-pressure extend-type actuator. It converts 0–200mA control current into precise linear mechanical displacement to adjust fuel throttle position. Equipped with built-in LVDT position feedback, it forms closed-loop regulation to restrain speed fluctuation and frequency drift caused by load disturbance, ensuring stable standalone operation and load sharing for parallel units. With fully sealed industrial structure, it features vibration resistance and EMC anti-interference performance, serving as the key spare part of power station speed control loop under harsh oil, dust and wide-temperature working conditions.
Hardware Architecture
The actuator adopts integrated die-cast aluminum sealed housing, consisting of five core units: proportional electromagnetic drive unit, built-in LVDT position feedback unit, spring reset safety mechanism, sealed EMC protection unit and high-precision mechanical guide transmission unit. It realizes linear current-displacement conversion, real-time stroke monitoring and fail-safe shutdown protection, with conformal coated PCB to resist environmental corrosion and electromagnetic interference.
Mounting & Supporting System
- Mounting Method: Flange fixed installation, supports in-situ replacement of standard TM25 series actuators
- Mechanical Feature: Extend stroke, female thread output shaft for connecting throttle linkage
- Wiring: Shielded multi-core cable with sealed terminals for control signal, feedback and power supply
- Supporting Devices: Governor, MPU speed sensor, 24VDC power supply, shielded control cables
- Typical Industries: Industrial power stations, oil & gas field units, marine generators, small steam turbine control systems.
Product Characteristics
- Closed-loop proportional regulation with high linearity ensures stable speed and balanced load distribution for parallel generator sets.
- Built-in return spring realizes fail-safe fuel cut-off under power loss or signal disconnection to prevent overspeed accidents.
- Wide-range DC voltage design resists grid voltage fluctuation and transient surge without misoperation or stuck stroke.
- IP54 fully sealed rugged structure with three-proof PCB coating guarantees 24/7 continuous operation in dusty, oily and high-vibration industrial sites.
- Standard TM25 mechanical dimensions enable direct spare part replacement without mechanical reconstruction, shortening equipment downtime.
- Onboard EMI filter effectively eliminates electromagnetic interference from frequency converters and high-voltage equipment to avoid throttle jitter and abnormal speed drift.
II. Technical Specifications
2.1 Electrical Parameters
- Control Signal: 0–200mA DC proportional current
- Rated Power Supply: 24VDC (18～32VDC allowable fluctuation)
- Feedback Type: Built-in LVDT AC differential position signal
- Insulation Class: Class B; Compliant with CE EMC standards
- Wiring Requirement: Shielded cable with single-end grounding
2.2 Mechanical Performance
- Type: TM25 low-pressure, extend stroke, female threaded output shaft
- Repeat Positioning Accuracy: ≤±0.2% full stroke
- Linearity: ≤±0.5% full scale
- Fail-Safe Function: Automatic reset to minimum fuel position upon power loss
2.3 Environmental Specifications
- Operating Temperature: -30℃～+75℃
- Storage Temperature: -40℃～+85℃
- Humidity: 5%～95%RH non-condensing
- Ingress Protection: IP54; Vibration Compliance: IEC 60068-2-6
2.4 Mechanical Specifications
- Housing: Die-cast anti-rust aluminum alloy with anodizing anti-corrosion treatment
- Outlet: Oil-resistant sealed shielded cable; Mounting: Flange fixed installation
III. Key Features
- Precise closed-loop fuel throttle regulation stabilizes unit frequency and realizes balanced load sharing for parallel grid-connected generator sets.
- Fail-safe spring reset mechanism cuts fuel supply to avoid overspeed risk when power or control signal is lost.
- Real-time stroke feedback via integrated LVDT compensates regulation deviation caused by mechanical friction and temperature variation to improve dynamic response.
- Rugged sealed construction adapts to harsh industrial environments including power plants, oil fields and ships for long-term reliable operation.
- Standard mechanical and electrical interfaces facilitate quick on-site maintenance and spare part replacement with simple parameter calibration.
IV. Working Principle
After 24VDC power is supplied, the governor outputs 0–200mA proportional current according to the deviation between actual and set speed. The electromagnetic coil generates driving force to push the actuator rod outward to adjust fuel opening. The onboard LVDT sensor transmits real-time stroke data back to the governor for closed-loop position correction to eliminate regulation error. Once power or control signal fails, the built-in return spring retracts the rod to the minimum fuel position to shut down the unit safely.
V. Application Scenarios
- Speed control for industrial diesel/gas generator sets for standalone operation and grid parallel load sharing.
- Engine governor actuator for oil & gas field compressors to stabilize rotating speed and process pressure.
- Marine generator set speed regulation adapting to high humidity, salt fog and continuous vibration conditions.
- Inlet valve executive component for small industrial steam turbine control systems matched with Woodward governors.
- Technical renovation replacement for aging stuck actuators of legacy power equipment.
