API Spec 7NRV (R2020) PDF
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Specification for Drill String Non-return Valves, First Edition, Includes Addendum 1 (2019)
American Petroleum Institute , 07/01/2006
API Spec 7NRV (R2020) PDF
This standard was formulated to provide the minimum acceptable requirements for Drill String Non-return Valve (NRV) equipment. It covers Drill String Non-return Valves, Non-return Valve Subs, Non-return Valve landing nipples, Non-return Valve Equalizing Heads and all components that establish tolerances and/or clearances which may affect performance or interchangeability of the NRV equipment. Non-return Valve Subs, Non-return Valve landing nipples, Non-return Valve Equalizing Heads and NRVs manufactured by different facilities or manufacturers may be supplied as separate items.
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