Actuation for Steam Turbines

The CPC-DX (current-to-pressure converter dual transfer) is a hydraulic pressure control skid designed for use in positioning single-acting steam turbine valve servos in critical applications. This Redundant CPC skid includes two CPC-II units configured in a master/slave configuration. The master unit controls output pressure; the slave unit tracks master unit operation and bumplessly takes control of output pressure should there be a failure with the master unit. Optionally users can switch between converters to verify unit operation, and replace either converter on-line, should there be a need.

The Woodward Electrohydraulic Power Cylinder (EHPC) provides the force to operate the control valves of a steam turbine. The EHPC is intended for use on mechanical drives or generator driven turbines. The EHPC integrates the actuator, pilot valve, electronic feedback device, final driver, and the power cylinder into a single package, eliminating linkage and reducing hydraulic plumbing and wiring.

The Woodward H-Spring Actuator is a modular, high-pressure, hydraulic actuator designed for high-force linear or rotary valve control applications requiring failsafe functionality. The actuator can be configured for either modulating or on/off services. Both custom and standard configurations are available to match the required application. H-Spring actuators are designed for use in utility steam turbine control valves and stop valves, gas turbine steam admission valves and bypass air valves, and in general process applications.

The electrically controlled Woodward Hydraulic Amplifier is a pilot-operated, linear servo actuator used in conjunction with the Woodward 2301, 505 Series or MicroNet electronic controls. The amplifier contains a Woodward EG-3P actuator which converts the electric control signal to a rotary output which controls the servo output position taken by the amplifier. The amplifier is capable of operating the control mechanisms for steam turbines or large engines which require relatively large forces and work capacity.

The Woodward ProAct™ Digital Plus actuator is intended to be mounted on-engine to control varying functions including (but not limited to): fuel rack positioning, timing control, throttle valve, and wastegate positioning. The actuator is effectively a positioner with an integral driver, which will accept a position command signal from another device in the system such as a speed control. The ProAct™ Digital Plus actuator includes an integral digital driver capable of controlling the actuator, communicating with the outside control system, and containing on-board software and intelligence to realize monitoring and customizing functions.

The Woodward Servo Position Controller (SPC) is a servo-valve driver that accepts a DeviceNet™ or 4?20 mA based position demand signal from a system controller, and accurately positions proportional or integrating servo-valves. The SPC has the required accuracy, responsiveness, and redundancy required for steam or gas turbine fuel valve control. For valve position sensing, the SPC accepts feedback signals from one or two (redundant) ac devices or one dc device. A Windows based software program is used to configure the SPC, adjust tunables, and monitor parameters via a personal computer. For ease of service, SPC configurations can be done while connected or disconnected to the unit. Once a configuration has been created, this program allows configurations to be uploaded and downloaded to other SPCs as desired.

The Woodward TM-25LP and TM-200LP actuators are electrohydraulic, proportional actuators for positioning steam and fuel-control valves requiring low/high force linear inputs.

The Woodward UG-Actuator and UG40 Actuator offer the advantages of electronic control and load sharing systems while using the convenient, existing UG-type drives and linkages. The actuators provide the muscle for Woodward analog controls such as the 2301A, as well as Woodward digital controls such as the 500-series, 700-series, and the IGEM engine management system. The actuators can be used with diesel, gasoline, or natural gas engines, as well as with steam and industrial gas turbines. The actuators have a self-contained oil sump so a separate oil supply is not required.