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Q: I would like to ask the experts here. I’m a beginner. What standards do S370 NPS3/4″ Class800, S305 NPS1″ Class600, and S360 NPS10″RF Class150 refer to? Is it a valve? Why can’t I find it?
Those S370 values don’t mean anything; NPS is the nominal diameter, RF refers to the type of flange sealing surface, and those numbers after 150 represent the nominal pressure in pounds per square inch. Take a look at the specifications on the drawing
It should be the standard for flanges; check ASME B16.5
It should be a specification for a flange; S370 is presumed to be a type of material. NPS refers to the nominal diameter of the flange, while Class 800 indicates the pressure rating, in pounds, which is equivalent to PN in national standards. RF denotes the type of sealing surface on the flange