The valve installed is a Euro Manu'f. valve based on the manu'f. valve "Data Tag". DN 100 translates as 100mm valve - 3.937" close enough to 4". End Connection: a150 indicates ansi class 150#. pressure 1030 kilopascals (I'll let you do the pressure conversion). As for the rest of the information on valve type, body material, disc, stem, and seals this is tied up in the manuf's. fig.no. and catalog data for that fig.no. Also, the tag no. WSC-501 refers to the butterfly valve number in the owners spec. system. There ought to be a "Data-Spec sheet" lying around somewhere that lists the full assembly details of that valve. Unless IT, in it's infinite wisdom, decided it didn't need to be uploaded into the New data base and threw it away years ago.

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