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What is the class of a valve?

One of the most widely used valve standards is 34, Valves-Flanged, Threaded, and Welding End. There are three types of classes: standard, special, and limited. B16 is a journal. Class 150, 300, 400, 600, 900, 1500, 2500, and 4500 valves are covered by 34.

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