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The Leakage Class of a Control Valve can be: Class I: any rate agreed to by the buyer and seller. Class II through Class IV: range from being a .5% to .01% of full flow Class V and Class VI: These two ranges are fairly tight shut off classifications and are rate in bubbles per minute under test conditions set forth by the NIST. More information about the test conditions and measurement details can be found online.

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Q: What is the leakage class of control valve?
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