Description

Woodward 9907-1107 – CPC Current-to-Pressure Converter

Product Overview

The Woodward 9907-1107 is a legacy Woodward part number associated with the CPC current-to-pressure converter family used in turbine valve-control systems. The CPC is an electrohydraulic pressure-regulating device that converts a controller’s electrical demand signal into hydraulic control pressure for positioning turbine governor-valve servos. Woodward documentation describes CPC technology as intended primarily for steam-turbine valve control, with 4-20 mA demand inputs, internal pressure feedback, PID regulation, fail-safe operation, and optional redundant control arrangements. Publicly indexed Woodward documentation does not provide a sufficiently reliable specification table for the exact 9907-1107 ordering code, so pressure range, hazardous-area classification, and revision should be confirmed directly from the unit nameplate before replacement. Woodward also states that older CPC products were superseded by CPC-II configurations.

Technical Specifications

For reference, Woodward’s CPC-II documentation specifies 4-20 mA control demand, an internal pressure sensor and PID controller, RS-232 service access, 24 VDC operation, and electrohydraulic pressure regulation. Those values should not automatically be applied to the 9907-1107 without confirming the specific revision.

Woodward 9907-1107

Key Features and Benefits

• Designed for electrohydraulic turbine-valve control.
• Converts electrical demand into controlled hydraulic pressure.
• Closed-loop pressure feedback supports precise servo positioning.
• Suitable for steam-turbine speed and load-control systems.
• Legacy CPC architecture can be found in critical turbine applications requiring dedicated spare management.
• Replacement planning should account for hydraulic pressure range, electrical configuration, and area certification.

Personally, I would not approve this part for direct substitution based on the part number alone. Woodward’s own support guidance recommends using the complete part number and revision from the nameplate when selecting configuration files or replacement hardware.

Related Models

9907-1106 — Legacy CPC reference identified by Woodward as a 0-10 bar Zone 2 model with CPC-II replacement 9907-1200.

9907-1102 — Legacy CPC reference identified for a 0-25 bar configuration, with CPC-II replacement 9907-1198.

9907-1199 — CPC-II 0-10 bar configuration for Zone 1 and Zone 2 applications.

9907-1200 — CPC-II 0-10 bar Zone 2 configuration intended for modernization of compatible legacy CPC installations.

Installation and Maintenance

Before replacement, verify the complete nameplate information, hydraulic pressure range, electrical demand signal, supply voltage, hazardous-area certification, connector arrangement, and servo-valve interface. Inspect hydraulic ports and associated tubing for contamination, leakage, or incorrect routing.

For legacy CPC equipment, do not assume a CPC-II unit is a drop-in replacement. Woodward documents specific replacement mappings and adapter arrangements for certain older CPC and non-Woodward converters.

Maintenance should include inspection of hydraulic cleanliness, electrical connections, pressure feedback, control-signal stability, and actuator response. Any turbine-control work must follow the plant’s approved shutdown, isolation, and overspeed-protection procedures.

Product Warranty

Warranty coverage depends on supplier, condition, and purchase agreement. For an obsolete or legacy control, confirm whether the unit is new old stock, refurbished, tested used, or surplus. Request the exact nameplate part number, revision, serial number, test report, and warranty terms before procurement.

The Woodward 9907-1107 should be managed as a legacy turbine-control spare, with exact revision and configuration verification completed before installation.