Description
Product Description
The WOODWARD 5136-RE2-PCI is a high-performance, digital electro-hydraulic actuator (EHA) designed for precise, closed-loop control of steam turbine inlet valves, including main stop and control valves. It serves as the critical final control element in turbine governing systems, converting a control signal into precise mechanical position. This robust actuator integrates a sophisticated servo valve, linear variable differential transformer (LVDT) for feedback, and dedicated control electronics, making the WOODWARD 5136-RE2-PCI a self-contained positioning system. Its reliability and precision are paramount for maintaining turbine speed, load, and pressure. The design of the 5136-RE2-PCI emphasizes fail-safe operation and compatibility with Woodward’s leading governors. Selecting the correct WOODWARD 5136-RE2-PCI configuration is essential for optimal turbine performance and protection.
Product Parameters
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Product Type: Digital Electro-Hydraulic Actuator (EHA) for Steam Turbines.
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Control Input: Accepts standard analog command signals (e.g., 4-20 mA, ±20 mA) or digital commands via integrated communication options.
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Feedback: Internal LVDT(s) for precise, closed-loop spool position feedback.
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Hydraulic Supply: Requires a clean, regulated hydraulic fluid supply at a specified pressure (e.g., 1500-3000 psi typical).
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Stroke: Available in various stroke lengths to match specific valve requirements.
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Force Output: High force capability to overcome steam forces on large turbine valves.
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Communication: May include optional digital communication protocols (e.g., Modbus, Woodward’s HAYES®) for configuration, diagnostics, and advanced control.
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Enclosure: Rugged, industrial housing suitable for installation in turbine deck environments.
Advantages and Features
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High Precision & Repeatability: Provides extremely accurate and repeatable valve positioning for superior turbine control and efficiency.
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Fast Response Time: Capable of very rapid movement to respond to load changes, frequency disturbances, or emergency trip signals.
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Integrated Intelligence: Contains onboard electronics for signal processing, closed-loop control, and self-diagnostics, reducing reliance on external controller bandwidth.
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Fail-Safe Design: Typically designed to drive the valve to a predefined safe position (e.g., closed) on loss of signal or power, enhancing turbine safety.
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Robust Construction: Built to withstand high vibration, temperature variations, and the harsh conditions near a steam turbine.
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Advanced Diagnostics: Provides valuable feedback on actuator health, performance, and alarm conditions, enabling predictive maintenance.
Application Cases in Various Fields
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Power Generation (Coal/Gas): Precisely positions control valves on steam turbines in utility or industrial power plants to regulate speed and load in response to grid demands.
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Industrial Cogeneration: Controls extraction/admission valves on back-pressure or extraction turbines in pulp/paper, chemical, or refining plants to balance electrical generation with process steam needs.
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Oil & Gas: Governs steam turbines driving large compressors or pumps on offshore platforms or in refineries, ensuring stable process operation.
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Marine Propulsion: Used in the governing system for main propulsion steam turbines on naval or specialized vessels.
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Geothermal Power: Controls steam admission valves on turbines using geothermal steam sources.
Comparison with Competing Products
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Vs. Voith (Digital Electrohydraulic Actuators): Voith offers similar high-performance digital EHAs. The <a href=”https://www.woodward.com/products/industrial/controls/governors/actuators-positioners-and-drives/5136-RE2-PCI” target=”_blank”>WOODWARD 5136-RE2-PCI</a> is often noted for its deep integration and proven interoperability with Woodward’s governor controllers (505, 501, etc.), creating a seamless, vendor-optimized control loop.
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Vs. Bosch Rexroth (Hydraulic Servo Actuators): Bosch Rexroth provides industrial servo cylinders and valves. Woodward’s 5136-RE2-PCI is a purpose-built, application-engineered package specifically for turbine valve control, including all necessary electronics, feedback, and safety features in one integrated unit, simplifying engineering.
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Vs. Older Analog/Pneumatic Actuators: The digital 5136-RE2-PCI offers vastly superior accuracy, diagnostic capabilities, and responsiveness compared to legacy analog or pneumatic actuation systems, enabling more efficient and reliable turbine operation.
Selection Suggestions and Precautions
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Match Valve Specifications: The actuator must be selected based on the specific valve’s required stroke, force (based on steam loads), and mounting interface. Consulting the valve manufacturer’s data is crucial.
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Verify Hydraulic System Compatibility: Ensure your plant’s hydraulic power unit (HPU) can provide the required fluid type, cleanliness (e.g., NAS 1638 Class 6), pressure, and flow rate for the 5136-RE2-PCI.
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Define Control Interface: Specify the exact command signal type (4-20mA, etc.) and determine if digital communications are needed for integration with a DCS or PLC.
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Consider Environmental Conditions: Confirm the actuator’s temperature, humidity, and vibration ratings are suitable for its intended installation location on the turbine.
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Professional Installation & Calibration: Installation, piping, and calibration (including LVDT nulling and gain settings) must be performed by personnel trained on Woodward equipment. Improper setup can lead to poor control or equipment damage.
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Source from Authorized Channels: Purchase from Woodward or authorized distributors to ensure genuine parts, proper configuration, access to technical support, and necessary firmware. Counterfeit or incompatible actuators pose a severe risk to turbine safety and availability. Always refer to the official Woodward manual for the specific 5136-RE2-PCI part number variant.
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