You must install, maintain, inspect, repair, and test all SSVs in accordance with API STD 6AV2 (incorporated by reference in § 250.198 ). If any SSV does not operate properly, or if any gas and/or liquid fluid flow is observed during the leakage test as described in § 250.880 , then you must shut-in all sources to the SSV and repair or replace the valve before resuming production.
30 C.F.R. §250.820