The Flowserve Logix 3800, Logix 3200MD, Logix 520MD, and Logix 420 digital valve positioners are advanced smart positioners designed to deliver precise, reliable, and repeatable control of pneumatic control valves in demanding industrial environments.

These positioners support rotary and linear actuators and are widely applied across oil and gas, chemical processing, power generation, refining, water treatment, and general process industries. With digital control technology, robust diagnostics, and flexible communication options, the Logix series significantly improves valve performance, process stability, and plant efficiency.

• High-precision digital valve positioning
• Compatible with linear and rotary control valves
• Supports pneumatic diaphragm and piston actuators
• Advanced valve diagnostics and performance monitoring
• Fast response and accurate positioning under varying loads
• Easy local and remote configuration
• HART communication support on applicable models
• Rugged industrial design for harsh environments
• Low air consumption and stable control
• Suitable for control and on off valve applications

• Premium digital positioner with advanced diagnostics
• High accuracy and repeatability
• Ideal for critical control applications

• Microprocessor-based digital valve positioner
• Compact design with reliable performance
• Widely used replacement for legacy positioners

• Cost-effective digital positioner
• Reliable control for standard industrial applications
• Easy commissioning and maintenance

• Electropneumatic positioner
• Simple and robust design
• Suitable for basic control valve automation

Positioner Type

Digital and electropneumatic valve positioners

Input Signal

4 to 20 mA

Supply Pressure

Instrument air supply depending on model

Actuator Compatibility

Linear actuators

Rotary actuators

Communication

HART protocol available on digital models

Accuracy

High positioning accuracy depending on model

Operating Environment

Designed for industrial temperature and vibration conditions

Mounting

Standard NAMUR mounting options available

• Control valve automation in oil and gas production
• Chemical and petrochemical processing
• Power generation and utilities
• Refining and downstream processing
• Water and wastewater treatment
• Industrial flow, pressure, and temperature control systems

• Improves control valve accuracy and repeatability
• Enhances process stability and product quality
• Reduces valve wear and unplanned downtime
• Provides actionable diagnostics for predictive maintenance
• Supports digital plant and smart instrumentation strategies
• Trusted Flowserve quality and global support

Flowserve Logix digital valve positioners receive a control signal from the control system and precisely regulate air pressure to the actuator. Integrated sensors continuously monitor valve position and adjust output pressure in real time, ensuring the valve reaches and maintains the commanded position even under changing process conditions.

Advanced diagnostics help detect friction, air supply issues, and valve performance degradation, allowing maintenance teams to act before failures occur.

Are Flowserve Logix positioners compatible with non Flowserve valves

Yes, they support standard NAMUR mounting and can be used with many third-party control valves.

Do these positioners support HART communication

Logix 3800 and Logix 3200MD models support HART communication.

Can they be used for rotary actuators

Yes, both rotary and linear actuators are supported depending on configuration.

Are they suitable for harsh industrial environments

Yes, they are designed for demanding industrial service.

Can they replace older analog positioners

Yes, they are commonly used as direct upgrades for legacy pneumatic and analog positioners.

• Flowserve control valves
• Flowserve pneumatic actuators
• Flowserve Logix 510Si digital positioner
• Flowserve valve accessories
• Valve position feedback modules