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Recent content by potus101985

  1. potus101985

    SPExSPE

    Hi stiaf, Query on your statement, "A DBB valve has 2 seating surfaces to have seat sealing against pressure from both upstream and downstram the valve (SPE X SPE). " For a valve to have a DBB function, is it a requirement to have both pressures on upstream and downstream? What if pressure on...
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