1- Don´t forget to purchase diagnostics software. 2- Don´t forget to train maintenance crew on valves diagnostics 3- Try to find out how much supplier will charge you for software upgrade. 4- Don´t ever biuy a positionr diagnostics that cannot analyse 0% and 100% travel.
~David Rodrigues, Technical Support, Salvador - Bahia, Brazil
Use clean well filtered and dry instrument air > problems with relay shuttle valve causes problems due to contamination causing sticking and erratic action in overshoot
~John E, Control Systems Engineer, Houston, TX
Purchase valve positioners that are digital (smart ) and can have modular communication card in case the plant will upgrade from HART to FIELDBUS OR MODBUS
~Sansin D, Engineer, Cebu City, Philippines
The valve should be chosen in accordance with the type of fluid (density, viscosity etc)
~Fayez A, Process Engineer, Belfort, France
Choose a big brand product, ask for demonstration of easy operation and maintenance.
~Albert J, Engineer, Heng-chun, TAIWAN
Material, temp. range, pressure rating should be correct to application
~Hien Dang, Engineer, HCM, Vietnam
Many companies have some old valves . Mounting kit is very important.
~Bosko Belancic, Leading maintenace engineer, Kikinda, Serbia , Europe
The i/p conversion must be robust this is the hart of the positioner.
~Antonio C, Engineer, Ver/Cardel, Mexico
Use pneumatic positioners for applications need stable and accuracy.
~Thuan Nguyen minh, Instrumentation & Automation, Vung tau, Vietnam
Recommend abb fisher siemens
~Hou Ben, Project Manager, Shanghai, Cn
BE SURE OF YOUR APPLICATION
~ED STEUTERMANN, Manufacturer, LOUISVILLE, KY
Research and compare
~Randy G, Facilities Manager, Northbrook, IL