Digital guide
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Woodward 8915-782
- Product Type: 3151A Water Valve with TM-40LP Actuator Assembly
- Core Function: Metered water injection into gas turbine combustors for NOx emission reduction
- Medium: Water (valve section); Mineral or synthetic based oil, diesel fuel, or light distillate fuel (actuator hydraulic section)
- Flow Rate: Minimum 3.8 L/min (1 US gal/min); Maximum 250 L/min (66 US gal/min)
Detailed content
- Supply Pressure (Water): 2413–10 342 kPa (350–1500 psig)
- Maximum Bypass Pressure: 345 kPa (50 psig)
- Hydraulic Supply Pressure: 2758–8274 kPa (400–1200 psig)
- Flow Accuracy: 5.0% of point or 0.5% of maximum flow
- Filtration (Water): 10 μm nominal, 20 μm absolute
- Temperature Range: Water 0–66 °C (32–150 °F); Ambient –40 to +93 °C (–40 to +200 °F)
- Material Composition: Stainless steel valve body; replaceable hardened stainless-steel cavitation sleeve; ceramic metering/regulator parts; actuator aluminum case with hardened stainless steel internals
- Structural Features: Variable-area-metering valve with contoured ports; single-stage throttling delta-P regulator piston; TM-40LP electrohydraulic proportional actuator; optional LVDT; dual-coil torque motor option for redundancy
- Working Principle: Electronic control drives the TM-40LP actuator to position the metering plunger; port opening is determined by plunger position; the delta-P regulator piston senses and controls pressure drop across metering ports so flow is unaffected by variations in valve inlet or discharge pressures
- Applications: Gas turbine water/steam injection for NOx reduction; works with Woodward digital and analog controls; can be calibrated to follow fuel-flow schedule
- Installation Requirements: Install per Woodward 3151A Water Valve/TM-40LP Installation and Operation Manual; water supply must meet 10 μm nominal / 20 μm absolute filtration; hydraulic supply 2758–8274 kPa
- Usage Notes: Read all manuals before installation, operation, or service; do not use equipment outside specified limits; observe ESD handling precautions—avoid synthetic clothing, do not touch PCB conductors or components; unauthorized modifications constitute misuse, void warranty, and invalidate certifications
