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MATERIALS HANDLING


VALUE-ADDED valves


When it comes to designs for controlling hot processes, it’s all material, says Ian Webster


Bei den Designs für die Steuerung von heißen Prozessen kommt es vor allem auf das Material an, sagt Ian Webster


Quand il s’agit de conceptions pour contrôler des processus haute température, c’est une entrée en matières, affirme Ian Webster


P


The latest Type 2000 angle seat valve benefi ts from a space-saving valve body design


rocess engineers are required to deliver a diffi cult balancing act that requires a robust and reliable process to


be maintained while keeping costs to a minimum. Sometimes, a short-term view may identify some cost savings when replacing components with lower cost items within in the process control system. However, looking at the operation from the point of view of total cost of ownership (TCO), this may reveal a false economy in the long run. One example of this would be process


control valves, many of which may be very similar in outward appearance, but taking a closer look can reveal some important design characteristics that can aff ect performance and reliability. The materials that are used to create the various components of the valve dictate the range of suitable applications in which it may be used. Manufacturers should provide details of these materials and their properties to simplify the selection process. Since the properties of the media


that is being manipulated by the process control system are known, it is the responsibility of the process engineer to select the most appropriate design, based on this knowledge. Two of the most pertinent factors are temperature and chemical composition, as these have a major infl uence on the materials that can be included in the design of the control valve.


EXTREME 34 www.engineerlive.com


ENVIRONMENTS Control valves that are destined for operation with aggressive fl uids or


Bürkert has set out to offer a wide range of high quality, fully tested valve body and valve seat materials


extremes of temperature must be equipped with the correct seal materials and constructed from high quality materials to deliver reliability and effi ciency. Production downtime caused by a faulty control valve can result in substantial costs, so quality valves can off er protection for the workforce and the bottom line. In designing the latest version of


its Type 2000 angle seat valve, Bürkert has invested in the technology and the equipment required to produce a cost- eff ective solution by off ering a wide range of high quality, fully tested valve body and valve seat materials. To provide its customers with the highest quality guarantee, the company has invested in considerable production assets in Europe, where quality control and design integrity are paramount. The designers specifi ed valve spindle


seals manufactured from PTFE as standard but these can also be delivered with FKM or PEEK seals and wipers.


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