Feature sponsored by Flow, level & control
application’s parameters. This can make what should be a simple, like-for-like swap, a complex and onerous task for the plant engineer. Even if involving a third-party supplier, it can extend procurement time and still require the provision of a detailed specification. Otherwise, it can mean assumptions made by the supplier in specification that might not ensure optimum control valve accuracy. In many cases, the extent of the end-user’s
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knowledge is that they require a particular size of modulating control valve. However, to ensure that it is correctly specified, the valve supplier might ask for details that the engineer probably does not have easy access to, such as flow rate or the viscosity of the media. In reality though, for the vast majority of applications it is fast and simple to specify the right control valve, based on three simple criteria, readily available to the end user.
THREE STEPS TO SPECIFICATION The first question is: what does the valve primarily control? The answer is a choice between flow, temperature, or pressure. Secondly, what media is the valve controlling and what is the application type? This provides general clarification on whether a liquid, steam or gas is involved, and confirms aspects such as whether the media is aggressive. Understanding the application type also confirms aspects such as the specific hygienic requirements of the design, as well as the control type required, for example, modulating or isolation. Thirdly, inlet line size should be confirmed. To quickly specify a complete package with
part numbers, including the right control valve with process controller, sensor, and cables, Bürkert has developed a Valve Sizing Calculator, based on the three selection steps. In action, the Valve Sizing Calculator, provides a specification that ensures control accuracy as well as flexibility.
hen a replacement control valve is required, it is often the case that the user is not aware of the full specification detail or the
Simple steps to successfully size control valves
Specifying a replacement control valve can be a challenge. Making the right choice ensures optimum system control and accuracy, but sizing requires time, as well as a certain level of expertise. To help resolve these challenges, flow control specialist, Bürkert, has released a new tool that makes sizing and specifying a control valve for nearly all applications a fast and simple process. Kieran Bennett, industry manager – Food & Bev at Bürkert, explains how to specify a control valve.
Bürkert has released a new tool that makes sizing and specifying a control valve for nearly all applications a fast and simple process.
16 October 2022 Instrumentation Monthly
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