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Woodward 8915-1156
Product Family: 3103 Gas Valve with EM35MR Electric Actuator
Key Family Design Features (verified from Woodward official manual 26734):
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All-electric actuator eliminates hydraulic oil supply entirely
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Brushless servomotor with samarium-cobalt permanent magnets; stator windings completely sealed
Detailed content
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Precision planetary gearbox with two resolver-type shaft position sensors (motor rotor position + output shaft position)
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Slip clutch allows full-speed impact into optional external rigid mechanical stops
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Cast aluminum explosion-proof housing with thermal potting compound for heat transfer
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Motor output shaft directly coupled to valve input shaft via stainless steel torsional coupling
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Inlet guide tube conditions inlet flow and directs contaminants through metering port
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Metering sleeve support bearings positively sealed from gas
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Self-cleaning metering structure adapts to sour gas service
Verified Family Performance:
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Output Shaft Rotation: 60°
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Continuous Output Torque: ±24.86 N·m (±220 lb-in)
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Peak Output Torque: ±62.4 N·m (±552 lb-in)
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Clutch Release Torque: ±68 N·m (±600 lb-in)
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Torque Constant: 1.8 N·m/A
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Slew Rate: >600°/sec at 24 Vdc motor terminal
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Component Weight: ~44 kg (96 lb)
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Gas Connection: 2-inch 600# ANSI B16.5 flange
Installation & Usage: Same requirements as documented for 8915-1152 — 25 µm absolute gas filtration, shielded resolver wiring, protected conduit entries, strict contaminant limits (<10 µm particles ≤30 ppm, >10 µm ≤0.3 ppm), and avoidance of over-pressure/over-temperature operation.
Note: Exact flange size, port configuration, and certification variant of 8915-1156 require confirmation from Woodward factory documentation. Current Woodward literature directs new designs to GS40/GS50 Series as upgrade replacements for the 3103/EM35 family.
