API SPEC 7NRV:2006+ADD1:2019
Superseded
A superseded Standard is one, which is fully replaced by another Standard, which is a new edition of the same Standard.
A superseded Standard is one, which is fully replaced by another Standard, which is a new edition of the same Standard.
Specification for Drill String Non-return Valves, First Edition, Includes Addendum 1 (2019)
Hardcopy , PDF
06-11-2020
English
01-12-2019
This standard was formulated to provide the minimum acceptable requirements for Drill String Non-return Valve (NRV) equipment.
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