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Woodward 8915-135
Possible Family Association: Given the numerical proximity to verified parts such as 8915-111 (control valve, TM55P/3103), 8915-123 (control valve-gas fuel TM55P/3103 hi temp 1″ port), 8915-185 (3103/TM55P control valve), 8915-135 likely belongs to the 3103 gas valve with TM55P electro-hydraulic actuator family.
Verified TM55P/3103 Family Baseline (from Woodward official manual 40106):
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Valve Body: Stainless steel with through-hardened stainless steel internal parts
Detailed content
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Inlet guide tube minimizes contaminant accumulation in valve housing
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Sleeve support bearings positively sealed from gas
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TM-55P Actuator: Anodized aluminum case; internal parts through-hardened stainless steel
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Hydraulic fluid sealed from torque motor by preformed packing ring
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Supply pressure inlet contains 40 µm filter fitting
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Internal mechanical feedback standard; optional electrical position transducer (RVDT, ±0.16° accuracy)
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Flow Range: 23 to 18,144 kg/h (50 to 40,000 lb/h)
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Inlet Pressure: 6,206 kPa (900 psia) maximum; 4,964 kPa (720 psia) CE limit
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Differential Pressure: 172 to 6,206 kPa (25 to 900 psi)
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Gas Temperature: -40°C to +149°C
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Metered Fuels: Natural gas, propane, methane; specific gravity 0.5–1.05
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Contaminant Limits: <10 µm particles ≤30 ppm; >10 µm particles ≤0.3 ppm
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Flow Accuracy: ±5% of point or ±0.25% of maximum flow; ±2% at stops
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Hydraulic Supply: 400 to 1,000 psig external supply oil (no external driver needed for proportional version)
Working Principle: Electronic control current passes through dry-coil torque motor servo valve, which amplifies the signal to control hydraulic oil flow to a double-acting servo piston. The piston motion rotates the valve output shaft, driving the 3103 valve metering sleeve to change opening. Internal mechanical feedback re-centers the servo valve at target position for precise proportional control. On loss of hydraulic supply or input current, the actuator spring biases the valve to minimum fuel position.
Installation & Precautions: Maintain hydraulic oil cleanliness to ISO 4406 20/18/15; install 10 µm filtration on hydraulic supply; meet gas inlet particle requirements; install in any attitude ensuring maintenance accessibility; verify calibration data matches the physical serial number.
Note: The exact configuration of 8915-135 (port size, pressure rating, certification, hydraulic vs. electric actuator) requires Woodward factory confirmation with the serial number. The statement above is based on the closest verified 8915-series family members and is not a verified specification for 8915-135 specifically.
