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Valve leakage class is a standardized rating that defines the maximum allowable internal leakage through a valve when it's fully closed Most commonly control valves leakage classifications are class i, class ii, class iii, class iv, class v, and class vi. These ratings range from class i (least strict) to class vi (most stringent).

Gemco valve offers valve solutions for various materials and processes with spherical disc design. This does not refer to external leakage (i.e., from flanges or seals), but to the leakage past the valve seat when the valve is supposed to be shut. Compare the leakage rates, test media, pressures and constructions of each class.

Compare the leakage rates for various valve types and sizes in liquid and gas tests.

≤ 0.01% of rated capacity With water or air under differential pressure Process applications with more stringent requirements This is the default class for most control valves unless otherwise specified.

Learn about the types, causes and standards of valve leakage, and how to choose the right leakage class for your application Valve leakage is a critical factor in industrial processes, affecting system efficiency, safety, and environmental compliance Valve leakage class refers to the standardized categorization of allowable leakage rates for valves under specific test conditions These classifications are essential for selecting the right valve for applications ranging from oil and gas to water treatment

Control valve leakage classification refers to the maximum allowable internal leakage rate across a closed valve under defined test conditions

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