Woodward CPC‑II 9907-1200 Current pressure (electro-hydraulic) converter
The Woodward 9907-1200 (CPC‑II) is a high‑precision current‑to‑pressure (electrohydraulic) converter designed for steam turbine governor valve control. It converts a 4–20 mA DC electronic signal into a proportional hydraulic pressure output to accurately position single‑acting steam turbine valves. Built with a rugged aluminum housing, self‑cleaning ports, and corrosion‑resistant materials, it delivers reliable performance in harsh industrial environments, including those with contaminated oil. The unit supports redundant inputs and features a failsafe mechanism, making it ideal for safety‑critical turbine applications.
Application Fields
- Power Generation: Steam turbine control in thermal, combined‑cycle, and cogeneration power plants; critical for grid stability and load following.
- Oil & Gas: Refinery steam turbines, compressor drives, and offshore platform power systems; handles high‑pressure and hazardous area requirements.
- Chemical & Petrochemical: Reactor and distillation unit steam valve control; ensures precise process pressure and temperature regulation.
- Pulp & Paper: Steam turbine drives for paper machines and mill utilities; supports continuous operation in dusty, humid environments.
- Industrial Utilities: District heating plants, industrial steam systems, and process industries requiring accurate electrohydraulic signal conversion.
Technical Specifications
| Parameter | Specification |
|---|---|
| Model Number | 9907‑1200 (CPC‑II) |
| Product Type | Current‑to‑Pressure (Electrohydraulic) Converter |
| Input Signal | 4–20 mA DC |
| Output Pressure | 0–10 bar (0–145 psi) / 3–15 psi (pneumatic version) |
| Supply Pressure | 20–30 psi (1.4–2.1 bar) (pneumatic) / Hydraulic supply as required |
| Accuracy | ±0.5% of span |
| Response Time | <1 second to 90% of step change |
| Power Supply | 24 VDC (±10%) @ 1 A |
| Operating Temperature | -40°C to +85°C (-40°F to 185°F) |
| Enclosure Rating | NEMA 4X / IP66 |
| Housing Material | Aluminum (corrosion‑resistant) |
| Mounting | Panel or 35 mm DIN rail |
| Dimensions (H×W×D) | 163 mm × 38 mm × 58 mm (6.4″ × 1.5″ × 2.3″) |
| Weight | 0.35 kg (0.77 lbs) |
| Certifications | CE, ATEX, IEC 61508 (SIL 2) |
| Redundancy | Dual 4–20 mA input support |
| Failsafe | Spring‑return to safe closed position |
Function
- Precise Signal Conversion: Translates 4–20 mA DC control signals into proportional hydraulic pressure (typically 0–10 bar / 0–145 psi) for accurate steam turbine valve positioning.
- Turbine Speed/Load Regulation: Works with Woodward or third‑party controllers to maintain stable turbine speed and load, reducing mechanical wear and improving efficiencyWoodward.
- Redundancy & Fault Tolerance: Accepts dual redundant 4–20 mA inputs and supports master‑slave configurations to eliminate single points of failure.
- Failsafe Operation: Integral return spring forces the valve to a safe closed position during power or signal loss, preventing overspeed events.
- Harsh Environment Reliability: Self‑cleaning port design and ISO 20/16 oil contamination resistance ensure long life in dirty oil conditions.
- Easy Calibration: Features zero and span adjustments for straightforward field setup and maintenance
Recommended Similar Series Products (3–5 Units)
All below are Woodward CPC‑II series or compatible electrohydraulic/pneumatic converters for turbine and process control applications:
-
9907‑1201
- Type: CPC‑II Current‑to‑Pressure Converter (high‑temperature variant)
- Use Case: Steam turbine control in extreme high‑temperature environments (up to +100°C).
-
9907‑1202
- Type: CPC‑II Current‑to‑Pressure Converter (low‑pressure output)
- Use Case: Small‑to‑medium steam turbines requiring 0–5 bar (0–72.5 psi) output pressure.
-
9907‑1203
- Type: CPC‑II Current‑to‑Pressure Converter (explosion‑proof)
- Use Case: Hazardous area (Zone 1/21) turbine control in oil, gas, and chemical plants.
-
9907‑1199
- Type: CPC‑I Current‑to‑Pressure Converter (legacy model, drop‑in compatible)
- Use Case: Retrofit projects replacing older CPC‑I units with modernized controlsWoodward.
-
5464‑331
- Type: Electrohydraulic Servo Valve (compatible with CPC‑II outputs)
- Use Case: High‑dynamic steam turbine valve actuation requiring faster response than standard convertersWoodward
There are no reviews yet.