Digital guide
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Woodward 8915-775
- Product Type: 3151A Water Valve with TM-40LP Actuator Assembly
- Core Function: Metered water injection into gas turbine combustors for NOx reduction
- Medium: Water (valve section); Mineral or synthetic based oil, diesel fuel, or light distillate fuel (actuator hydraulic section)
- Flow Rate: 3.8–250 L/min (1–66 US gal/min)
Detailed content
- Supply Pressure (Water): 2413–10 342 kPa (350–1500 psig)
- Hydraulic Supply Pressure: 2758–8274 kPa (400–1200 psig)
- Hydraulic Fluid Viscosity: 0.6 to 400 centistokes; Specific gravity 0.6–1.0
- 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: Valve body primarily stainless steel; hardened stainless-steel replaceable sleeve; ceramic metering/regulator components; actuator contained in aluminum case with internal hardened stainless steel parts
- Structural Features: Variable-area-metering valve; single-stage delta-P regulator piston; TM-40LP electrohydraulic proportional actuator of “extend-with-increasing-current” design; optional LVDT for position feedback; dual-coil torque motor option for redundancy
- Working Principle: The TM-40LP actuator receives electronic control commands to position the water valve; the metering plunger position determines port opening; the delta-P regulator maintains constant pressure differential across metering ports so flow remains unaffected by inlet/discharge pressure variations; optional LVDT feeds actual position back to the control
- Applications: Gas turbine water injection for NOx reduction; compatible with Woodward digital and analog electronic controls; control can be calibrated so the water valve closely follows the fuel-flow schedule to prevent unwanted water insertion during turbine load swings
- Installation Requirements: Install per Woodward 3151A Water Valve/TM-40LP Installation and Operation Manual (publication 40120); ensure water filtration to 10 μm nominal / 20 μm absolute; provide hydraulic supply at 2758–8274 kPa; align with high-pressure centrifugal pump
- Usage Notes: Read the entire manual and all related publications before installing, operating, or servicing; do not modify or operate outside specified mechanical, electrical, or other operating limits; avoid static buildup—wear cotton or cotton-blend clothing, do not touch PCB components with hands or conductive devices; unauthorized modifications void warranty and invalidate certifications
