ASCO Solenoid Valves and Flowserve Logix 520MD Digital Hart Valve Positioner Valve Controller

The Flowserve Logix 520MD+ and 510+ are advanced digital valve positioners designed for precise control in industrial applications. The 520MD+ model supports HART communication for enhanced diagnostics and remote management, while the 510+ offers basic functionality. These two-wire, loop-powered devices (4-20 mA) utilize piezo valve technology for reliable operation with single or double-acting actuators, linear or rotary mountings. They ensure accurate stem positioning through a closed-loop feedback system, making them ideal for harsh environments with features like explosion-proof certifications and optional LCD displays for local monitoring.

• Quick-Cal Calibration: One-button stroke calibration for fast setup, including auto-tune for optimal gains.
• Diagnostics Levels: Standard for basic safety/position monitoring; Advanced adds pressure data; Pro includes force analysis, friction detection, and on-line health monitoring.
• User Interface: 8-DIP switches for configuration, 10-position gain selector, tri-color LEDs for status, optional LCD for detailed menus and alerts.
• Auxiliary Options: Up to two multi-function cards for AO (position feedback), DO (alarm indication), DI (PST trigger or override); limit switches and remote mount for flexibility.
• HART Communication: Enables burst mode, digital commands, and integration with ValveSight DTM for advanced dashboards and reports.
• Safety and Reliability: SIL 3 capable, RFI/EMI immune, humidity sensor, and over 130 alarms/warnings for predictive maintenance.
• Venting and Purging: Supports natural gas with vented design; purging for single-acting actuators to prevent corrosion.

Suitable for process industries in severe environments, such as oil and gas, chemical processing, and power generation, where vibration, corrosion, or hazardous areas are concerns. Used for throttling control, emergency shutdown valves, and systems requiring predictive maintenance via diagnostics. Ideal for Mark One linear or MaxFlo rotary valves, supporting fail-safe operations up to SIL 3.flowserve.com

• How do I perform a Quick-Cal? Press and hold the QUICK-CAL button for 3 seconds; ensure the Quick-Cal switch is set to Auto or Jog based on valve stop type.
• What if the positioner doesn't respond? Check compliance voltage (at least 10V for 520MD+); verify polarity and minimum 3.8 mA current.
• Can it handle natural gas? Yes, with proper venting to route exhaust safely; use purging for single-acting actuators to avoid corrosion.
• How to change HART version? Remove covers, adjust DIP switch on main board, then replace covers; positioner recognizes change immediately.
• What diagnostics are available? Standard: position/electronics; Advanced: adds pressure; Pro: includes friction, force, and on-line monitoring via ValveSight DTM.

Phone/WeChat/WhatsApp: +8613916209596

Email: svetama@gbsxj.com

• ValveSight DTM: For advanced diagnostics and configuration.
• Logix 3400MD: Higher-end digital positioner with FOUNDATION Fieldbus.
• Mark One Control Valves: Linear globe valves compatible with Logix positioners.
• MaxFlo Rotary Valves: Eccentric plug valves for rotary applications.
• Limit Switches: Mechanical, reed, or inductive options for position feedback.