Is the flange of a 40-kilogram valve concave or RF?
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I’ve seen in many specification documents that RF is used for valves weighing 40 kilograms. Nowadays, for 40-kilogram valves, are concave sealing surfaces more common or are RF surfaces more common? Which one is more commonly used
Currently, concave sealing surfaces are more commonly used for the flanges of 40-kilogram valves. Although some material specifications require the use of RF, with advances in technology, installing concave sealing surfaces has become easier and the sealing performance is better; as a result, concave surfaces are more widely used in practical applications. .
It really depends on the medium; for materials that are prone to leakage and pose high risks, a textured surface should be used
Under normal circumstances, concave flanges are generally used.
Generally, for a rating of 4.0, RF is used more often, as the pressure level isn’t that high. Additionally, if a concave surface is used, it requires higher installation standards. It can be either RF or a conventional flange, with low requirements for installation.