Woodward Marine CPC Valve Modules – 8901-457

Technical Dossier

Product Details And Specifications

Woodward Marine CPC Valve Series Technical Notes

The Woodward Marine CPC (Combustion Pressure Control) Valve series represents a critical control component deployed across global heavy marine and industrial installations, including LNG carriers, offshore drilling platforms, marine propulsion systems, and stationary power generation units. Woodward, headquartered in Fort Collins, Colorado (USA), has supplied precision fuel and combustion control hardware to the marine and energy sectors for over a century. The CPC Valve series is engineered to regulate fuel admission and combustion pressure in gas and dual-fuel engines, ensuring stable ignition timing, emissions compliance, and engine protection under variable load conditions. These valves are found in installations operated by major shipping companies, naval fleets, and offshore energy operators across Europe, Asia-Pacific, and the Americas.

The Evolution of Marine CPC Valve Architecture

Woodward's CPC Valve technology has evolved through several distinct engineering generations. Early-generation CPC valves (pre-2000) were primarily pneumatically actuated with analog signal interfaces, designed for single-fuel (diesel or gas) engine platforms. These units relied on mechanical feedback loops and were integrated into Woodward's legacy 505 and 723 governor control platforms.

The mid-generation series (2000–2012) introduced electro-hydraulic actuation, digital position feedback (LVDT sensors), and compatibility with Woodward's MicroNet and NetCon distributed control architectures. This generation added dual-fuel capability, enabling engines to switch between gas and diesel modes under load — a critical requirement for LNG-fueled vessels subject to MARPOL Annex VI emissions regulations.

Current-generation CPC Valves (2013–present) feature fully digital control interfaces (CAN, Modbus, PROFIBUS), integrated diagnostics, and compatibility with Woodward's ProTech and easYgen control platforms. Redundant position sensing and fail-safe spring-return mechanisms are standard. Many earlier part numbers in this series have been superseded or declared end-of-life (EOL), creating sustained demand for certified aftermarket and refurbished units.

Marine CPC Valve Full Catalog & Functionalities (SKU List)

The following SKUs represent verified part numbers within the Woodward Marine CPC Valve and associated combustion/fuel control product range. Each entry reflects a distinct functional role within the control architecture:

8901-457: Marine CPC Valve, electro-hydraulic actuator, dual-fuel gas/diesel, LVDT position feedback, spring-return fail-safe.
8901-458: Marine CPC Valve variant, extended stroke configuration for high-displacement engines.
8901-460: CPC Valve assembly with integrated pressure transducer, suitable for high-pressure gas admission.
8901-462: Compact CPC Valve for medium-speed marine diesel engines, analog 4–20 mA control input.
8901-465: CPC Valve with digital CAN interface, compatible with MicroNet TMR control systems.
8901-470: High-temperature CPC Valve variant, rated for exhaust-adjacent installations up to 120°C ambient.
8272-1027: Woodward fuel admission valve, gas engine series, direct-acting solenoid, 24 VDC coil.
8272-1028: Fuel admission valve, dual-coil redundant configuration, SIL 2 rated.
8256-045: Woodward gas admission valve actuator assembly, compatible with Wärtsilä and MAN B&W engine platforms.
8256-046: Gas admission valve actuator, extended-life seal kit variant for tropical/high-humidity environments.
1712-1003: Woodward electro-hydraulic servo valve, used in CPC Valve hydraulic actuation circuits.
1712-1004: Servo valve, high-flow variant for large-bore engine CPC applications.
5462-839: Woodward LVDT position sensor assembly, direct replacement for CPC Valve feedback element.
5462-840: LVDT sensor, extended-range variant, ±25 mm stroke measurement.
9907-838: Woodward MicroNet control module, primary interface for CPC Valve digital control loop.
9907-839: MicroNet I/O expansion module, analog input/output for CPC Valve position and pressure signals.
5501-470: Woodward ProAct actuator, used in conjunction with CPC Valve assemblies on gas engine governors.

Quality Control for the Marine CPC Valve Range

Woodward Marine CPC Valves incorporate precision electro-hydraulic actuation mechanisms, LVDT position feedback circuits, and high-pressure hydraulic sealing assemblies. Standard incoming inspection at DriveKNMS includes visual inspection for mechanical damage, corrosion, and seal integrity; electrical continuity and insulation resistance testing on all solenoid coils and LVDT windings; hydraulic pressure testing of valve body and actuator circuits at rated working pressure; functional stroke testing with calibrated position feedback verification; and coil resistance measurement against OEM specification tolerances.