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What is the difference between rangeability and turndown?

Generally, the terms rangeability and turndown ratio are associated with control valve sizing and flow measuring devices.

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Generally, the terms rangeability and turndown ratio are associated with control valve sizing and flow measuring devices.
Rangeability defined as the ratio of maximum controllable flow to the minimum controllable flow that a device designed to. So this is a theoretical value before a device installed.
The turndown ratio gives the width of the operational range of a device/valve. It is not required to handle the maximum possible flow. It defined as the ratio of normal operating maximum system flow to the minimum controllable flow. In the case of boilers turndown ratio is the ratio of maximum heat output to the minimum level of heat output at which the boiler will operate controllably.

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Will Don

After earning my bachelor's degree in mechanical engineering from Zhejiang Normal University in 2008, l was fortunate enough to begin my career with Siemens, Fisher, and YTC, focusing on control valve accessories. Over the past dozen years, l've poured my heart and energy into understanding technology and fluid solutions for control valves.
Now, as the marketing director for THINKTANK, a trusted branch of the Taiwan STONE valve group, I can't help butf eel proud of how far we've come. Our knowledge isn't just reaching professionals like engineer and valve distributors; it's also inspiring the next generation of automation college students.
l genuinely hope you're enjoying our articles and finding them helpful.Your thoughts, questions, and feedback mean the world to me, so please don't hesitate to reach out to marketing[at]cncontrolvalve.com. Whether you're a seasoned expert or just curious about the field, I'm here to connect, share, and learn together.

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I am the author of this article, and also the CEO and marketing director of THINKTANK, with 15 years of experience in the industrial valve industry. If you have any questions, you can contact me at any time.

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