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  1. minhvu17

    Double-isolation and bleed valve and Double-block and bleed

    Dear LittleInch,JSOSA555 and Gorman3 I am very grateful to find this forum as well as the people like you guys. It helps and enlightens me a lot. Thank you so much to you guys. Hope you could help me again when any questions come up. Warm regards.
  2. minhvu17

    Double-isolation and bleed valve and Double-block and bleed

    Thank you very much,JSOSA555 1. As your explanation, i understand that if DBB valve has pressure only 1 side so only 1 seat is energized so only 1 seal is provided. Therefore, we cant call it Double Block and Bleed valve. Is this right? 2. DBB valve provides a seal against pressure from both...
  3. minhvu17

    Double-isolation and bleed valve and Double-block and bleed

    Hi all, I am very new to valve and pipeline. While reading through the API 6DSS, i have notice about definition of DIB and DBB which im not so clear of 1. Double-Block and Bleed Valve (DBB) – A single valve with two seating surfaces that, in the closed position, provides a seal against pressure...

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