What is the Difference Between #150, #300, and #600 Pound Flanges?
Pressure class definitions for flanged valves can be a little confusing at first, but they're actually quite simple. Part of the confusion in this rating system stems from the interchangeability of the pound symbol--#--the abbreviation, lb or lbs, and pound or pounds. While all of these designate the pressure rating of the flange, none of them directly indicate the amount of pressure the flange can actually handle. For example, a #150 pound flange rating does not correlate with 150 psig, as many people mistakenly assume.
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