WOODWARD 8200-226 Servo Position Controller (SPC)
8200-226 is a high-precision servo valve driver from Woodward’s SPC series, used for precise positioning of fuel / steam valves in gas / steam turbines and generator sets, replacing the older 8200-224/225 models.

Core parameters
Model: 8200-226
Brand: Woodward (USA)
Power supply: 24VDC (18–32VDC wide range), maximum 1.1A
Control signal: 4–20mA or DeviceNet bus command
Drive capability: Proportional/integral servo valve, position feedback accuracy ±0.1%
Operating temperature: -40°C ~ +85°C
Size/Weight: Approximately 185×120×45mm

Approximately 1.2kg
Certifications: SIL2, ATEX Zone 2, UL, etc.

Main functions
Precise servo valve drive: Receives 4–20mA or DeviceNet instructions, performs closed-loop control of the servo valve position, and regulates fuel/steam flow.
Turbine speed/load control: In gas/steam turbine systems, executes position instructions from governors or upper-level systems, stabilizing speed and output power.
Dual-mode communication: Supports analog (4–20mA) and DeviceNet digital bus, compatible with both new and old control systems.
Self-diagnosis and protection: Real-time monitoring of power supply, feedback, and communication failures, equipped with overcurrent, overvoltage, and short-circuit protection.

Typical applications:
Power generation: Gas/steam turbines, hydroelectric power station governors, generator fuel control systems.