• Description

The Woodward 9907-1228 is an enhanced CPC-II (Current-to-Pressure Converter) designed to translate a 4–20 mA command into a stable 0–10 bar hydraulic pressure. It’s typically used on single-acting steam turbine speed-control and stop/ratio valves where accuracy, response, and long service intervals matter. One thing I appreciate is how the enhanced “Silt Buster” logic keeps performance stable even when oil cleanliness isn’t perfect—something you run into in real plants.

Order Placement Process and Guarantees

• Warranty: 365 days from shipment

• Delivery: 1 week if in stock; no more than 1 month latest

• Payment: 50% advance; balance before delivery

• Express options: FedEx, UPS, DHL

Key Features

• 4–20 mA to 0–10 bar conversion – Proportional, isolated input drives stable hydraulic output up to 145 psi.

• Enhanced “Silt Buster” function – Adaptive purge logic helps clear ~40 μm contaminants without interrupting control.

• High accuracy and repeatability – Typical accuracy to ±0.2% of full scale; repeatability around 0.1% FS for tight valve positioning.

• Fast response – Sub-75 ms to 90% step is common, improving turbine load response and start-up sequences.

• Advanced control algorithms – PID with 11-point linearization improves low-flow and near-seat control behavior.

• Built-in diagnostics – Health/status monitoring, event history, and trending support predictive maintenance.

• Redundancy options – Dual 4–20 mA inputs with voting logic help maintain control if one source degrades.

• Rugged build – IP66 enclosure, wide operating temperature, and vibration/shock-tested for turbine skids.

• Service interface – RS-232 service port for configuration, testing, and calibration from a PC tool.

Technical Specifications