The Woodward CPC-II (Current to Pressure Converter, Generation II) is an electrohydraulic pressure-regulating valve control designed for precise positioning of single-acting steam turbine valve servos. Its superior accuracy, resolution, and built-in redundancy features make it ideal for critical steam turbine applications where turbine uptime and availability are essential.
Key Features
Control & Accuracy
- Accepts 4–20 mA pressure demand signal
- Precise oil pressure control for steam turbine governor valve positioning
- Internal pressure sensor with PID controller
- Millisecond response to valve step changes during system transients
- Factory and field configurable via PC-based PCI Service Tool
- 4–20 mA output for control oil pressure indication
- Alarm and shutdown relay outputs for unit health and status
Redundancy & Reliability
- Dual redundant pressure demand inputs from one or two controllers
- Internal + external redundant oil pressure sensing with voting
- Master/Slave configuration for online controller changes
- Dual CPC-II configuration for full system redundancy
- Failsafe spring-return to drain on any internal failure
- Self-cleaning rotary valve with single moving part
- Corrosion-resistant materials for dirty or contaminated oil service
Applications
- Single-acting steam turbine valve servo positioning
- Critical steam turbine applications requiring maximum uptime
- Redundant control system architectures (Master/Slave or Dual CPC)
- Turbine speed and load control systems
- Systems with dirty or contaminated hydraulic oil
Drake Controls Services
Drake Controls is a Woodward Authorized Distributor. We stock CPC-II units and provide repair, overhaul, and field support. The CPC-II is a frequent component in Drake steam turbine retrofit projects alongside the 505XT and Peak 200.