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ab baat karte hain field mein sab se zyada kaam aane wali cheez ki. Yani Valve Body Markings Identification ki. Kisi bhi valve ko system mein lagane se pehle us par mojood Essential Technical Tags ko parhna lazmi hota hai. Is mein sab se pehli marking NPS yani Nominal Pipe Size hoti hai. Jisay metric mein DN bhi kaha jata hai. Yeh valve ke size ko zahir karti hai. Jise che inch ya DN ek so pachaas ke taur par likha jata hai. Doosra tag valve ki Class ya Rating hoti hai. Yeh valve ki pressure jhelne ki taqat ko zahir karta hai. Jaise ek so pachaas, teen so, ya che so class. Teesra ahem tag iska Material Code hota hai. Yeh ASTM specification ke mutabiq body material ko zahir karta hai. Jaise carbon steel ke liye WCB ya A105 likha hota hai. Chautha ahem code iska Heat Number hota hai. Yeh material traceability code hota hai jo mill test reports ke liye zaroori hai. Fitters aur supervisors ke liye alert yeh hai, ke mechanical maintenance ya replacement ke waqt body markings ko purani pipeline ke design data se match karna nihayat lazmi hota hai. Galat rating ka valve lagane se line puncture ho sakti hai.
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