WOODWARD 5136-RE2-PCI

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

• Product Type: Digital Electro-Hydraulic Actuator (EHA) for Steam Turbines.

• Control Input: Accepts standard analog command signals (e.g., 4-20 mA, ±20 mA) or digital commands via integrated communication options.

• Feedback: Internal LVDT(s) for precise, closed-loop spool position feedback.

• Hydraulic Supply: Requires a clean, regulated hydraulic fluid supply at a specified pressure (e.g., 1500-3000 psi typical).

• Stroke: Available in various stroke lengths to match specific valve requirements.

• Force Output: High force capability to overcome steam forces on large turbine valves.

• Communication: May include optional digital communication protocols (e.g., Modbus, Woodward’s HAYES®) for configuration, diagnostics, and advanced control.

• Enclosure: Rugged, industrial housing suitable for installation in turbine deck environments.

Advantages and Features

• High Precision & Repeatability: Provides extremely accurate and repeatable valve positioning for superior turbine control and efficiency.

• Fast Response Time: Capable of very rapid movement to respond to load changes, frequency disturbances, or emergency trip signals.

• Integrated Intelligence: Contains onboard electronics for signal processing, closed-loop control, and self-diagnostics, reducing reliance on external controller bandwidth.

• 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.

• Robust Construction: Built to withstand high vibration, temperature variations, and the harsh conditions near a steam turbine.

• Advanced Diagnostics: Provides valuable feedback on actuator health, performance, and alarm conditions, enabling predictive maintenance.

Application Cases in Various Fields

• 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.

• 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.

• Oil & Gas: Governs steam turbines driving large compressors or pumps on offshore platforms or in refineries, ensuring stable process operation.

• Marine Propulsion: Used in the governing system for main propulsion steam turbines on naval or specialized vessels.

• Geothermal Power: Controls steam admission valves on turbines using geothermal steam sources.

Comparison with Competing Products

• 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.

• 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.

• 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

1. 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.

2. 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.

3. 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.

4. Consider Environmental Conditions: Confirm the actuator’s temperature, humidity, and vibration ratings are suitable for its intended installation location on the turbine.

5. 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.

6. 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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