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Why Do Different Control Valves Have Different Characteristics?

The inherent flow characteristic of the control valve is the relationship between the flow and travel of the valve to a constant pressure drop across the valve.

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The inherent flow characteristic of the control valve is the relationship between the flow and travel of the valve to a constant pressure drop across the valve.
The inherent flow characteristics of the valve are determined by the valve orifice and plug geometry. There are three types of inherent flow characteristics, namely linear and an equal percentage.

Linear flow Characteristics:
The linear flow characteristics show that the flow rate is directly proportional to the path of the valve. Control valves with linear flow characteristics are commonly specified for liquid level control. The sensitivity of a control valve with a linear flow characteristic is always constant.

Equal percentage characteristic:
These valves have a valve plug shaped so that each increase in valve lift increases the flow rate in a certain percentage of the previous flow. The relationship between the elevation of the valve and the size of the hole (and, therefore, the flow) is not linear but logarithmic.

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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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