Flowserve Digital Valve Positioners Logix 3800 3200 520 420 Series
Product Overview
Flowserve Logix Series digital valve positioners, including Logix 3800, Logix 3200, Logix 520, and Logix 420, are designed to deliver accurate, stable, and reliable valve control for pneumatic control valves in industrial process automation systems.
These smart valve positioners utilize advanced microprocessor technology to ensure precise valve positioning, fast response, and consistent performance under varying operating conditions. The Logix series supports analog and digital communication protocols, making them suitable for both legacy systems and modern digital plants.
Flowserve Logix positioners are widely used in oil and gas, chemical processing, power generation, water treatment, and general industrial applications where dependable valve automation is essential.
Key Features
- High-precision digital valve control for pneumatic actuators
- Supports 4–20 mA input signal
- HART communication available on selected models
- Fast response and excellent positioning accuracy
- Auto-calibration for simplified commissioning
- Advanced diagnostics for valve and actuator condition monitoring
- Compatible with linear and rotary control valves
- Low air consumption for efficient operation
- Rugged housing suitable for harsh industrial environments
- Easy retrofit for replacing analog valve positioners
Series Overview
Logix 3800
High-performance digital valve positioner designed for demanding process control applications, offering advanced diagnostics and enhanced accuracy.
Logix 3200
Smart digital positioner widely used for general industrial control valves, providing reliable performance and flexible configuration.
Logix 520
Compact and cost-effective digital valve positioner suitable for standard control applications and retrofit projects.
Logix 420
Electro-pneumatic positioner designed for reliable and stable valve positioning in basic control systems.
Technical Specifications
- Positioner type
- Digital valve positioner
- Input signal
- 4–20 mA DC
- Communication
- HART (model dependent)
- Valve compatibility
- Linear and rotary control valves
- Actuator types
- Single-acting pneumatic actuators
Double-acting pneumatic actuators
- Accuracy
- High positioning accuracy with low hysteresis
- Air supply
- Clean and dry instrument air
- Mounting
- NAMUR standard or custom mounting kits
- Enclosure
- Industrial-grade housing for indoor and outdoor installation
- Hazardous area approvals
- Available depending on model and configuration
Applications
- Control valve automation in oil and gas production and refining
- Flow, pressure, and level control in chemical and petrochemical plants
- Steam and utility control systems in power generation
- Water and wastewater treatment facilities
- General industrial process control and valve automation
- Retrofit of existing pneumatic control valves
Benefits
- Improves valve control accuracy and repeatability
- Enhances process stability and operational efficiency
- Reduces maintenance with built-in diagnostics
- Simplifies commissioning with auto-setup functions
- Supports digital plant strategies with HART communication
- Extends control valve service life
How It Works
The Flowserve Logix digital valve positioner receives a 4–20 mA control signal from the control system.
The internal microprocessor compares the signal with actual valve position feedback and adjusts the pneumatic output accordingly.
This closed-loop control ensures precise valve positioning while continuously monitoring valve and actuator performance.
Diagnostic information can be accessed locally or remotely, allowing predictive maintenance and reduced downtime.
Installation Overview
- Mount the positioner to the control valve or actuator using the correct mounting kit
- Connect the instrument air supply and pneumatic tubing
- Wire the 4–20 mA signal loop
- Perform auto-calibration and setup
- Verify valve stroke and response during operation
Frequently Asked Questions
Which Flowserve Logix model should I choose
Logix 3800 is suitable for advanced applications, Logix 3200 for general use, Logix 520 and 420 for standard or retrofit projects.
Are these positioners compatible with HART
Yes, HART communication is available on selected Logix models.
Can Logix positioners be used in hazardous areas
Certified versions are available depending on the model and configuration.
Do they support both linear and rotary valves
Yes, the Logix series supports both valve types.
Are these suitable replacements for analog positioners
Yes, they are commonly used for upgrading older electro-pneumatic positioners.
Related Products
- Flowserve Valtek Control Valves
- Flowserve Logix 3200MD Digital Valve Positioner
- Flowserve Pneumatic Valve Actuators
- Masoneilan SVI2 Digital Valve Positioner
- Fisher DVC6200 Digital Valve Controller
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