Xiangjing (Shanghai) M&E Technology Co., Ltd
| Payment Terms | T/T |
| Material | Aluminum Alloy |
| Type | Control,pneumatic |
| Power | Pneumatic,electric |
| Delivery Time | 5~8 weeks |
| Application | General,industrial |
| Standard | DIN,ANSI,BS,ASTM |
| Supply Ability | 2,750 units per year |
| Standard or nonstandard | Standard |
| Packaging Details | carton or wooden crate, 30 × 30 × 30 cm |
| Structure | Control,Angle stroke |
| Model Number | 520MD |
| Brand Name | Flowserve Logix |
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Product Specification
| Payment Terms | T/T | Material | Aluminum Alloy |
| Type | Control,pneumatic | Power | Pneumatic,electric |
| Delivery Time | 5~8 weeks | Application | General,industrial |
| Standard | DIN,ANSI,BS,ASTM | Supply Ability | 2,750 units per year |
| Standard or nonstandard | Standard | Packaging Details | carton or wooden crate, 30 × 30 × 30 cm |
| Structure | Control,Angle stroke | Model Number | 520MD |
| Brand Name | Flowserve Logix | ||
| High Light | Flowserve Logix 520MD valve positioner HART ，smart precision valve positioner control valves ，pneumatic control valve positioner HART 5/6/7 | ||
Product Overview
The Flowserve Logix 520MD is a smart precision digital valve positioner that communicates over HART. It accepts a two-wire 4-20mA control signal and generates a proportional pneumatic output to drive a valve actuator. All power comes from the 4-20mA loop. The unit handles single-acting actuators in both linear and rotary configurations.
A multi-variable gain tuning algorithm enables large step changes with minimal overshoot while still resolving very small step changes. The Auto-tune procedure cycles the actuator and measures the response, then automatically selects gain values that optimize performance. A gain modifier selector provides additional fine-tuning. DIP switches manage tuning mode and other common settings, while ValveSight software delivers standard diagnostic functions.
Calibration is fast, straightforward, and accurate, thanks to self-calibration and adjustable gain selection. Steady-state air consumption is low, and the two-stage control design provides faster response times and tighter control. The unit supports HART 5, 6, and 7 and is rated for hazardous areas.
Technical Specifications
| Parameter | Specification |
|---|---|
| Brand | Flowserve |
| Communication Protocol | HART 5, 6 and 7 |
| Input Signal | 4-20mA (HART), two-wire |
| Data Interface | Wired |
| Diagnostics | Standard Diagnostic functionality through ValveSight software |
| Supply Pressure | 1.5 to 6.0 bar (22 to 87 psig) |
| Output Signal | Pneumatic (0 to 100% of air supply pressure) |
| Linearity | < ±1.0% typical |
| Repeatability | < 0.2% |
| Deadband | < 0.2% |
| Mounting Type | Rotary and Linear actuators; Single-acting |
| Operating Temperature | -40°C to +80°C (-40°F to +178°F) |
| Enclosure Rating | IP66 / NEMA 4X |
| Housing Material | Industrial Aluminum |
| Weight | Approx. 3.5 kg |
| Minimum Operating Current | 3.6 mA (without AO); 3.83 mA (with AO) |
| Voltage Supply (Maximum) | 30 VDC |
| Air Consumption (Steady State) | 0.08 Nm³/h @ 1.5 bar to 0.12 Nm³/h @ 6.0 bar |
| Output Flow Capacity | Up to 7.0 Nm³/h @ 6.0 bar |
| Certifications | ATEX, FM, CSA, SIL 2 |
| Intrinsically Safe | Class I Division 1 Groups A-D |
| Non-Incendive | Class I Division 2 Groups A-D |
Application Industry
The Flowserve Logix 520MD is used in oil and gas, chemical processing, power generation, water treatment, and pharmaceutical industries. Key applications include pipeline and actuator control, reactor valve positioning, turbine bypass automation, flow regulation in plants, and hygienic valve operations. Its certified hazardous area rating makes it suitable for demanding process environments.
Common Problems
No LED blinking: Current is below 3.6 mA or wiring polarity is incorrect. Verify supply current is at least 3.6 mA and check polarity.
Erratic communications: HART signal issues. Check current source bandwidth is limited to 25Hz. Verify cable length and impedance. Use a compatible intrinsic safety barrier.
Unit does not respond to analog commands: Unit is in digital command mode or a calibration error occurred. Change command mode to analog. Recalibrate the unit.
Valve position reading not as expected: Position sensor mounting not at 180 degrees, stroke not calibrated, or MPC active. Reposition sensor. Calibrate stroke.
Position driven fully open or closed: Stroke not calibrated, Hall sensor inner loop not connected, wrong air action set, or tubing reversed. Calibrate stroke. Check hardware connections.
Friction Calibration Required: No friction calibration performed since factory reset. Perform Friction Calibration using the display menu, handheld, or DTM.
Replacement Models
The Flowserve Logix 520MD series is a mature digital positioner platform. For applications requiring additional safety integrity, the Logix 520MD+ variant offers enhanced features. For newer installations, the Logix 3200MD and Logix 3800MD are alternative models within the same product family. For cross-vendor alternatives, verify actuator mounting, travel range, and communication protocol before ordering.
Company Details
Business Type:
Manufacturer,Distributor/Wholesaler,Agent,Importer,Exporter,Trading Company,Seller,Other
Year Established:
2015
Total Annual:
30,000,000-50,000,000
Employee Number:
200~300
Ecer Certification：
Verified Supplier
Xiangjing (Shanghai) - Leading Distributor of Pneumatic and Electric Control Valves Established in Shanghai, China, Xiangjing(Shanghai) Mechanical and Electrical Tech Co.,Ltd has been a trusted distributor of high-quality pneumatic and electric control valves for many years. With extensive industr... Xiangjing (Shanghai) - Leading Distributor of Pneumatic and Electric Control Valves Established in Shanghai, China, Xiangjing(Shanghai) Mechanical and Electrical Tech Co.,Ltd has been a trusted distributor of high-quality pneumatic and electric control valves for many years. With extensive industr...
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