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Product Overview
The Woodward 9907-1106 is a CPC-II Current-to-Pressure Converter designed for electrohydraulic control of steam turbine valves and associated servo systems. It accepts an isolated 4–20 mA demand signal and regulates hydraulic control pressure in proportion to that command. Woodward documentation identifies this configuration for a 25 bar (363 psi) maximum supply pressure and a 0–10 bar (0–145 psi) control-pressure range. The unit combines a rotary hydraulic valve, brushless limited-angle actuator, pressure sensor, and electronic control circuitry in an anodized aluminum housing. A spring-return mechanism moves the hydraulic valve toward its bypass position when power is lost, supporting a defined fail-safe response.
Technical Specifications — 9907-1106
| Parameter | Value |
|---|---|
| Product Model | 9907-1106 |
| Manufacturer | Woodward |
| Product Type | CPC-II Current-to-Pressure Converter |
| Input Signal | 4–20 mA |
| Maximum Supply Pressure | 25 bar / 363 psi |
| Control Pressure Range | 0–10 bar / 0–145 psi |
| Internal Leakage | 2 L/min maximum at 25 bar inlet pressure |
| Housing | Anodized aluminum |
| Hydraulic Valve | Rotary 3-way valve |
| Feedback | Internal pressure sensor and actuator position feedback |
| Communication / Service Interface | PC-based service interface; verify exact hardware configuration |
| Ingress Protection | IP56 |
| Mounting | Flat mounting face with three mounting holes |
| Dimensions (HxWxD) | Refer to Woodward mechanical drawing |
| Weight | Verify actual unit and packaging |
| Application | Steam turbine valve and servo control |
The supply and control-pressure ratings are specifically documented for this part number in Woodward Manual 26448.
Woodward 9907-1106
Key Features and Benefits — 9907-1106
- Converts a 4–20 mA command into regulated hydraulic pressure.
- Designed for single-acting steam-turbine valve servo applications.
- 0–10 bar control-pressure range with up to 25 bar supply pressure.
- Integrated pressure sensing supports closed-loop pressure regulation.
- Rotary valve and actuator construction provides controlled hydraulic flow.
- Spring-return behavior establishes a defined hydraulic bypass position following power loss.
- IP56 housing protection supports appropriate industrial turbine environments.
- Intended for maintenance and replacement of installed CPC-II systems.
Related Models
9907-1103 — CPC-II configuration with a 10 bar maximum supply and 0–10 bar control-pressure range.
9907-1102 — CPC-II configuration for 25 bar supply and a higher 0–25 bar control-pressure range.
9907-1100 — CPC-II version for 10 bar supply and 0–25 bar control pressure.
9907-1191 — Another CPC-II model covered by Woodward Manual 26448; exact application and pressure configuration should be verified before substitution.
Installation and Maintenance — 9907-1106
Before installation, isolate electrical and hydraulic energy sources and verify that hydraulic pressure has been safely released. Confirm the 4–20 mA wiring, supply pressure, control-pressure requirements, mounting interface, and servo-valve configuration before commissioning.
Inspect hydraulic ports for contamination and check electrical connectors, enclosure seals, and mounting hardware. The hydraulic circuit should be clean and within the specified pressure limits. Personally, I would verify the existing servo-cylinder requirements and complete Woodward configuration before approving a substitute rather than selecting one solely by pressure rating.
Product Warranty — 9907-1106
Warranty coverage depends on supplier, condition, testing status, and purchase agreement. For used or refurbished turbine-control units, request functional-test information and verify hydraulic and electrical condition before shipment. The Woodward 9907-1106 should be matched to the installed turbine valve servo, hydraulic supply, input signal, and control-pressure range before commissioning.
