Digital guide
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Woodward 8904-736
Product Name: 3103 Gas Valve with TM-55P Electrohydraulic Proportional Actuator Assembly
Product Introduction: This assembly integrates the 3103 stainless steel rotary sleeve gas metering valve with the TM-55P electrohydraulic proportional actuator, delivering proportional fuel metering control for industrial gas turbines. The TM-55P actuator provides a generous amount of torque, ensuring stable control of the gas turbine and allowing the gas valve to overcome friction caused by gas contaminant buildup.
Detailed content
Technical Specifications:
- Valve Type: 3103 Rotary Sleeve Gas Metering Valve
- Actuator Type: TM-55P Electrohydraulic Proportional Actuator
- Stall Torque: 38 N·m at 2,758 kPa; 95 N·m at 6,895 kPa
- Time Constant: 0.025 seconds
- Maximum Speed: 920°/second
- Load Sensitivity: 0.05°/lb-ft at 1,000 psig
- Hysteresis: 0.25°
- Repeatability: 0.25°
- Threshold: < 0.25% of rated maximum current
- Input Signal: 0.020 to 0.200 A (0° to 45°)
- Coil Resistance: 26 Ω single coil; 40 Ω double coil
- Position Feedback: Optional RVDT (±0.16° linearity)
- Weight: Approximately 6.6 kg (actuator)
- Hazardous Area Certification: UL/CSA Class I, Div. 1, Groups C & D
Functional Features: Proportional control characteristic with linear output vs. input current; internal mechanical feedback maintains position without external feedback; dual-coil torque motor usable independently or in parallel; bias adjustment ensures fail-to-safe tendency to minimum fuel position upon power loss; 40 μm final stage filter built into the hydraulic supply port.
Application Scenarios: Gas turbine fuel proportional control; industrial engine speed governing; distributed generation systems; natural gas processing facilities.
Material Composition: Valve body in stainless steel (CF8M); actuator housing in cast aluminum; internal parts in hardened stainless steel; seals in fluoroelastomer.
Structural Features: Rotary sleeve throttling valve with TM-55P integral electrohydraulic proportional actuator; built-in 40 μm final stage filter; dual-coil torque motor servo valve; internal mechanical feedback.
Working Principle: The TM-55P actuator’s torque motor servo valve receives the electronic control signal to generate a differential pressure, driving the second-stage spool to regulate the supply oil pressure to the double-acting servo piston. The piston’s motion is re-centered through internal mechanical feedback to the nozzle, achieving output shaft rotation proportional to the input current. The 3103 valve sleeve rotates with the actuator output shaft, regulating the gas flow area.
Installation Requirements: Hydraulic oil cleanliness of ISO 4406 20/18/15 or higher; supply pressure of 2,758 to 8,274 kPa (400 to 1,200 psig); return pressure not exceeding 690 kPa (100 psi); use of a dither signal (25 Hz, 0-10 mA) is recommended to reduce static friction.
Usage Precautions: Avoid impact loads on the output shaft to prevent damage to seals and calibration; maintain original factory packaging during long-term storage; dual-coil configuration enables load sharing or redundancy; regularly inspect hydraulic oil cleanliness and filter status.
