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- Woodward
- 8200-188
- Digital Valve Positioner
- USA
- 261 × 173 × 57 mm
- 2.6 kg
- Xiamen, China
- New & In Stock
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Product Overview
The Woodward 8200-188 Digital Valve Positioner is a digital control component used to regulate the position of a valve or other final control element in industrial systems.
In a turbine or engine-driven installation, valve position directly affects how the machine responds to changing operating conditions. The positioner receives a control command and works with the associated valve actuator so that the valve reaches the required position.
A typical application may involve a steam or fuel control valve where the control system needs repeatable valve movement during startup, loading, unloading, or normal operation. Instead of treating the valve as a simple open/close device, the positioner forms part of a control loop in which the commanded position and actual actuator response are coordinated.
The 8200-188 is therefore most useful when examining the complete valve-control chain: controller, positioner, actuator, valve, feedback, and process response. A fault in any one of these areas can affect the final valve position.
Technical Specifications
| Parameter | Details |
|---|---|
| Manufacturer | Woodward |
| Model | 8200-188 |
| Product Type | Digital Valve Positioner |
| Main Function | Valve Position Control |
| System Role | Valve / Actuator Control Component |
| Control Type | Digital Control |
| Application | Industrial Valve and Turbine Control |
| Typical Use | Precise Valve Actuator Positioning |
| Dimensions | 261 × 173 × 57 mm |
| Weight | 2.6 kg |
Product Features
The 8200-188 is intended for applications where the position of a valve must follow an electronic control command.
Key characteristics include:
- Digital valve positioner functionality
- Electronic control of valve position
- Suitable for industrial control applications
- Interfaces with compatible valve actuators
- Applicable to turbine-related control systems
- Supports closed-loop valve positioning arrangements
- Useful for controlled changes in valve position
- Suitable for industrial machinery and process equipment
- Dimensions of 261 × 173 × 57 mm
- Stated weight of 2.6 kg
The positioner should be matched with the applicable actuator, valve mechanism, controller, and feedback arrangement.
Working Principle
A practical valve-control loop can be represented as:
Controller → 8200-188 → Actuator → Valve → Position Feedback → Controller
The controller determines the required valve position according to the operating condition. The 8200-188 processes the control command and works with the actuator to move the valve toward the required position.
Feedback from the valve or actuator allows the control system to determine whether the actual position corresponds to the requested position.
Consider a turbine application where a control valve regulates the energy supplied to the turbine. During acceleration, the valve may need to move gradually rather than immediately reaching a fully open position. During a load change, the controller can adjust the valve command again as the turbine operating condition changes.
The positioner therefore sits close to the final control element in the control chain, making its wiring, actuator compatibility, feedback signal, and mechanical linkage particularly important during troubleshooting.
Industrial Applications
The 8200-188 is suitable for industrial systems where electronic control of valve position is required.
| Application | Typical Use |
|---|---|
| Steam Turbine Systems | Control-valve positioning |
| Industrial Turbines | Turbine control-valve operation |
| Power Generation | Final control element positioning |
| Process Equipment | Modulating valve control |
| Engine and Prime-Mover Systems | Actuator position management |
| Compressor Systems | Turbine or process valve control |
| Industrial Energy Systems | Controlled valve movement |
| Automated Process Systems | Electronic valve positioning |
The exact application depends on the valve, actuator, controller, and process requirements.
Compatible System Components
The 8200-188 normally operates together with several components forming the valve-control loop.
| Component | Function |
|---|---|
| 8200-188 | Processes valve-position commands |
| Control System | Generates the required valve position |
| Valve Actuator | Converts the position command into mechanical movement |
| Control Valve | Regulates the process or turbine medium |
| Position Feedback Device | Reports actual valve or actuator position |
| Speed / Process Sensors | Provide operating-condition information |
| Control Wiring | Carries command and feedback signals |
| Power Supply | Supplies electrical power to the control hardware |
| Turbine or Process Equipment | Receives the controlled flow |
| Protection System | Handles applicable equipment protection functions |
Correct operation depends on the relationship between the positioner and the mechanical valve-actuator assembly.
Installation and Maintenance
Installation should take into account the control cabinet environment, wiring arrangement, actuator interface, and mechanical condition of the valve.
Before replacing the 8200-188, document the existing connections and verify the relationship between the positioner, actuator, controller, and feedback circuit.
Recommended checks include:
- Confirm the complete 8200-188 part number.
- Verify the valve-control application.
- Check power connections.
- Inspect command-signal wiring.
- Verify actuator connections.
- Check position-feedback wiring.
- Inspect connectors for loose or damaged contacts.
- Check grounding and shielding where applicable.
- Inspect the valve linkage and mechanical movement.
- Verify that the actuator can move through its expected range.
- Check for mechanical sticking or excessive resistance.
- Record relevant configuration information before replacement.
- Perform controlled valve-position testing after installation.
If the valve does not reach the commanded position, the positioner should not automatically be identified as the cause. The actuator, feedback circuit, valve linkage, mechanical valve condition, and controller output should also be checked.
Recommended Related Models
For the 8200-188, related components should be selected according to the type of valve-control system and the connected actuator.
| Model / Component | Type | Primary Function | Application |
|---|---|---|---|
| Woodward 8200-188 | Digital Valve Positioner | Valve position control | Industrial valve systems |
| Woodward 8200 Series Control Modules | Control Hardware | Electronic control functions | Turbine and prime-mover systems |
| Woodward Valve Actuators | Actuator | Valve mechanical positioning | Industrial control |
| Woodward Speed Sensors | Sensing Device | Equipment speed feedback | Turbine control |
| Control Valves | Final Control Element | Flow regulation | Process and turbine systems |
| Turbine Control Systems | Control System | Turbine operating control | Power generation and industry |
When selecting a replacement, verify the exact positioner model, actuator interface, valve mechanism, feedback arrangement, controller output, and application requirements.
Key Advantages
- Digital valve positioner functionality
- Electronic valve-position control
- Suitable for industrial control systems
- Supports actuator-based valve positioning
- Applicable to turbine control applications
- Works within a feedback-based control loop
- Suitable for process and power-generation equipment
- Dimensions of 261 × 173 × 57 mm
- Stated weight of 2.6 kg
Technical FAQs
What is the difference between a digital valve positioner and a conventional valve actuator?
The actuator produces the physical movement of the valve, while the positioner manages the actuator response according to the required valve position. The two components normally work together as part of the final control element.
What should be checked if the valve stops at an incorrect position?
Check the controller command, positioner input, actuator response, position feedback, mechanical linkage, and valve movement. A discrepancy between commanded and actual position can originate from either the electronic or mechanical side of the system.
Why is position feedback important for the 8200-188?
Position feedback allows the control system to determine the actual valve or actuator position. Without an accurate feedback signal, the system may not be able to determine whether the valve has reached the requested position.
Can a mechanical valve problem cause symptoms that resemble a positioner fault?
Yes. Valve stem friction, linkage problems, mechanical obstruction, or an actuator issue can prevent the valve from following the position command even when the positioner is operating normally. Mechanical movement should therefore be checked during troubleshooting.