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Why is reduced trim required in control valves?

Control valves sizing is according to the requirements of application and must meet both CV and speed criteria.

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Control valves sizing is according to the requirements of application and must meet both CV and speed criteria.

So when the valve has a CV capacity lower than the maximum possible in the valve size, it is necessary use reduced setting.

The most common reason for reduced setting is that the flow rate is low for the required valve size, particularly when the 1” size valve has been specified as the smallest size to be used. Some end-users stipulate that no control valves should have less than two sizes smaller than the pipe line, it means the valve should not be less than half the size of the size of the line.

The second reason is that in gas or high-pressure steam applications, the control valve is invariably sized at the speed limits of the output port and required CV is much smaller than the total internal diameter CV.

How to Size a Level Control Valve

Meet Our Team and Why You Choose THINKTANK

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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