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Flowserve Logix 520MD Plus Digital HART Positioner 4 20mA Control Valve Actuator Oil Gas Chemical Power

1
MOQ
US $1800.00 - 1900.00/ Set
Price
Flowserve Logix 520MD Plus Digital HART Positioner 4 20mA Control Valve Actuator Oil Gas Chemical Power
Features Gallery Product Description Ratings & Review Request A Quote
Features
Specifications
Protocol: HART 5 6 7 Compatible
Input Signal: Two Wire 4 To 20 MA
Technology: Piezoelectric
Basic Infomation
Brand Name: Flowserve
Model Number: 520MD
Payment & Shipping Terms
Packaging Details: Cardboard box/Wooden crate
Delivery Time: 4-6 weeks
Payment Terms: T/T
Supply Ability: 3000 sets per year
Product Description
Flowserve Logix 520MD Plus Digital HART Valve Positioner
Product Overview
  1. Adopts advanced piezoelectric technology with 4–20mA two-wire HART 5/6/7 communication for valve actuator control.
  2. Built-in over 130 valve diagnostic alarms, supporting ValveSight DTM software for real equipment health monitoring.
  3. Supports on-site quick auto-calibration and local jog operation without handheld communicator.
Technical Specifications
Category Official Standard Parameters
Input Signal 4–20mA DC, HART protocol; loop voltage ≥10VDC, max 500Ω load
Air Supply 1.5–6.2 bar; air quality meets ISA 7.0.01 standard.
Control Performance Linearity <±1.0%; resolution <0.1%; fast startup within 1 second
Environment Standard temp: -20℃~+80℃; IP67 housing; ATEX / FM intrinsically safe certification
Software & Hardware Local LCD & LED indicator; single/double acting actuator compatible; 10-year service life
Application Industry
  1. Oil & gas upstream/downstream pipelines for pneumatic regulating valve automatic control
  2. Chemical & petrochemical plants for corrosive medium flow adjustment valves
  3. Thermal power station boiler and steam pipeline control valve matching equipment
Common Problems & Solutions
  1. Control loop oscillation: Reduce proportional gain, clean internal spool valve and filter air supply.
  2. Position feedback failure: Check linkage connection, execute full stroke quick calibration.
  3. HART communication loss: Verify loop voltage and wiring, restart device after power cycle.
Replacement Models
  1. Flowserve Logix 521MD Plus / 522MD Plus high-end upgraded positioners
  2. Flowserve Logix 3200MD series double-acting digital HART positioner
  3. Masoneilan SVI2 AP universal HART valve positioner cross-brand substitute
Why Buy From Us
  1. Supply brand-new original Flowserve complete sets with factory test & explosion-proof certificates.
  2. Provide free calibration guidance and ValveSight DTM software operation training.
  3. 12-month official warranty with global after-sales technical support service.
Stock & Delivery Time
  1. Standard non-explosion Logix 520MD Plus models in stock, ship within 3–7 working days.
  2. Custom intrinsically safe ATEX/FM versions take 15–20 working days for production.
  3. Complete export customs documents provided for sea & air global logistics.
RFQ Form
  1. Specify explosion-proof grade and single/double acting actuator matching requirement.
  2. Confirm valve stroke range and working temperature environment parameters.
  3. Inform target order quantity to get accurate FOB USD tiered unit price.
Ratings & Review

Overall Rating

5.0
Based on 50 reviews for this supplier

Rating Snapshot

The following is the distribution of all ratings
5 stars
100%
4 stars
0%
3 stars
0%
2 stars
0%
1 stars
0%

All Reviews

O
Osama Qandeel
Saudi Arabia Mar 20.2026
Helpful (3)
We urgently needed control valve accessories for a shutdown project. They provided stock availability and shipped within 3 days, which helped us avoid production losses.
A
Amir Rezaei
United Arab Emirates Jan 6.2026
Helpful (6)
We have been cooperating for 3 years with stable supply and reliable service
L
leyla kh
United Arab Emirates Sep 12.2025
Helpful (10)
We purchased 20 units of valve positioners for a refinery project in UAE. Delivery was fast and technical support was very professional.
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Contact Person : Mr. Edward Zhao
Tel : +8615000725058
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No.6 Building,No.98 Lane, No.1 Fulian Road, Baoshan District, Shanghai, China
edward.zhao@gongboshi.com
+8615000725058
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