API SPEC 19V pdf download Subsurface Completion Isolation (Barrier) Valves and Related Equipment 1 Scope This specification provides the requirements for subsurface completion isolation (barrier) valves (SCIV) andrelated equipment as they are defined herein for use in the petroleum and natural gas industries. Included arethe requirements for design, design validation grades, quality levels, manufacturing, functional evaluation, repair,redress, handling, and storage....