Woodward CPC-DX Redundant Skid Mounted Current Pressure Converter

The CPC-DX 10 bar, 2 zone, redundant, has an enhanced dynamic dual transmission current-to-pressure converter skid for on-line (automatic and manual switching) service capability for uninterrupted operation to position single acting turbine valve servos in critical applications.

Features and Functions

Woodward's redundant skid-mounted current-to-pressure converter (CPC-DX) is an electro-hydraulic pressure-regulating control valve for positioning single-acting steam turbine valve servos/actuators.

The redundant version of the CPC-DX accepts a 4-20 mA pressure demand signal and accurately controls oil pressure to precisely position the single-acting steam turbine speed control valve.

Accurate and stable steam valve control is directly related to increased steam turbine speed and load control and reduced mechanical wear on the system.

The integrated design of the CPC-DX redundant version allows for the cost-effective purchase and installation of a hydraulic assembly that provides all the isolation and support benefits of a fully segmented current-to-pressure converter.

Manual isolation valves are included in the package, allowing the user to easily repair or replace each individual current-to-pressure converter.

Both automatic and manual transfer logic is available for this skid block assembly, depending on the design of the system.

The skid block's automatic transfer logic simplifies system design because it does not require external relay/switching logic to operate.

This minimises wiring at the converter-to-converter and control-to-converter interfaces.

The CPC's configurable alarm/shutdown logic allows the user to easily configure which system conditions force an automatic transfer from the master CPC to the slave CPC.

The manual transfer feature is also available for systems where the user wishes to switch between pressure converters via external logic or manual switching.

The master select discrete input is used to allow the user to easily and quickly select the desired control CPC.

An integrated oil pressure gauge allows the user to visualise which converter is in control and verify the skid's output oil collector pressure level.

Discrete output relay contacts can also be connected to system indications (lights, lamps, plant DCS) to assist in system operating condition monitoring.

Features:

Anti-fouling .

. No small passages to block .

.111 N (25 lb) rotary chip shear .

. Self-cleaning valve design

Automatic and manual switching

Fast changeover time

. Minimised system disturbances

Precise pressure control

Increased reliability

. High Pressure Signal Selection Design

. In-line Repairable

. Master/Slave Logic

Includes isolation valves

Protected with padlock

Large pressure gauge

Remote master/slave indication

Compact size

Available in 10 and 25 bar models

Division 2 and Zone 2 Hazardous Location Approved