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ab baat karte hain process piping ke sab se ahem component Non Return Valve ki. Yani Check Valve ki, jiska technical short code VDR hai. Yeh valve process system mein flow integrity maintain karta hai. Aur rotating equipment ki safety ke liye install kiya jata hai. Iski sab se pehli aur bunyadi specification yeh hai. Yeh ek Uni-directional valve hai. Yeh valve fluid ko sirf ek hi intended direction mein travel karne deta hai. Doosra technical feature iska Automatic Action hai. Is valve par koi handwheel, lever, ya actuator nahi hota. Yeh mukammal taur par fluid ke differential pressure se operate hota hai. Yeh khud-ba-khud operate hota hai. Iska sab se critical function Backflow Prevention hai. Upstream pressure drop hote hi, yeh valve bina kisi external operator ke close hota hai. Closure member ke net weight, gravity, aur fluid ke reverse pressure ki wajah se close hota hai. Yeh khud-ba-khud instantaneously close ho jata hai. Taake upstream equipment hydraulic shock se mahfooz rahe. Fitters ke liye critical alert yeh hai, ke installation ke waqt valve body par embossed Direction Arrow ko dekhna lazmi hai. Is arrow ko pipeline flow ke sath align karna lazmi hai. Agar directional alignment galti se bhi galat ho gayi, to fluid comp
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