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Woodward 8915-880
- Product Name: 3103 Gas Fuel Metering Valve complete with EM35 Actuator (EM35MR all-electric variant)
- Product Introduction: The Woodward 8915-880 pairs the 3103 gas fuel metering valve with an EM35 actuator. This configuration represents Woodward’s next-generation all-electric fuel valve solution, eliminating hydraulic fluid and its associated problems (contamination, cold-weather viscosity issues, leaks, and premature seal failure).
Detailed content
- Technical Specifications (3103 EM35MR variant):
- Maximum gas supply pressure: 720 psia (4,964 kPa) standard inlet pressure (CSA and CE); 900 psia (6,205 kPa) enhanced inlet pressure (CSA and CE)
- Fuel temperature: –40 to +300 °F (–40 to +149 °C)
- Ambient temperature: –40 to +200 °F (–40 to +93 °C)
- Input voltage: 24 VDC
- Valve position feedback: high-accuracy resolver
- DVP driver options: 125 VDC or 24 VDC power input; IP30 or IP66 enclosure; EGD (Ethernet), CANopen, Analog (4–20 mA or 0–5 VDC), or PWM configurable inputs
- Functional Features: All-electric EM35MR actuator eliminates hydraulic contamination and maintenance issues; self-cleaning valve design operates in sour gas environments; DVP provides high-speed precise valve control; ID module enables plug-and-play installation and automatic valve-specific configuration detection; redundant EGD (Ethernet) or dual redundant CANopen communication options.
- Application Scenarios: Heavy-duty gas turbines where hydraulic actuator elimination improves reliability; applications requiring compliance with NERC cold-weather preparedness standards; frequent-start peaker units; gas turbine fuel control on contaminated or sour gas.
- Performance Parameters: Higher reliability design significantly increases maintenance intervals; improved control response and precision vs. hydraulic actuators; DVP Service Tool provides enhanced diagnostics and early indication of performance issues at the DCS operator terminal.
- Material Composition: Corrosion-resistant valve materials; stainless steel housing; through-hardened metering sleeve and seal shoe with hard surface coatings.
- Structural Characteristics: Rotating metering sleeve and seal shoe; resolver for position feedback; EM35 all-electric actuator; DVP driver in IP30 or IP66 enclosure; ID module integrated into valve/actuator for automatic configuration; connector, terminal block, or conduit connection options.
- Working Principle: Gas flows through the guide tube and metering port whose open area is set by sleeve position. The EM35 actuator, driven by the DVP (Digital Valve Positioner) based on control system demand (EGD Ethernet, CANopen, Analog, or PWM), rotates the sleeve to regulate fuel flow. Resolver feedback provides closed-loop position control. The DVP auto-detects valve-specific parameters via the ID module upon connection.
- Installation Requirements: Read the 3103 Installation and Operation Manual and DVP documentation before installation. Pair the EM35 actuator with a compatible Woodward DVP driver. Select appropriate DVP configuration: IP30 or IP66 enclosure, connector or terminal block outputs, 24 VDC or 125 VDC power input. Use pre-manufactured connectorized cables or terminal connections. Ensure proper grounding of shielded cables. Install upstream gas filtration. Most valves are drop-in replacements that do not require piping modifications; the Servovalve Interface option allows reuse of existing control system signal wiring.
- Usage Precautions: Do not operate outside specified pressure, temperature, or electrical limits — unauthorized modification constitutes misuse and voids warranty. Maintain gas cleanliness to protect the valve and resolver. Ensure proper DVP configuration and communication settings. Regularly inspect resolver feedback signal stability and electrical connector sealing. Use the DVP Service Tool for diagnostics and early performance issue detection. Follow Woodward OEM maintenance intervals; return the actuator to Woodward for overhaul at the recommended interval.
