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Posted by Joe Lambert on October 27, 2004 at 08:56:40:
In Reply to: VALVE posted by MANOJ PATEL on October 26, 2004 at 17:11:53:
The class is the general pressure rating of the valve. For flanged valves, it also determines the flange pressure rating and size. Most valves of similar type (ie: gate or globe) of the same class will have the same end-to-end dimensions.
The exact temperature/pressure ratings of each class of valve depend on materials of construction and can be looked up on an ANSI chart.
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