This International Standard provides the minimum acceptable requirements for subsurface safety valves (SSSVs). It covers subsurface safety valves including all components that establish tolerances and/or clearances which may affect performance or interchangeability of the SSSVs. It includes repair operations and the interface connections to the flow control or other equipment@ but does not cover the connections to the well conduit. NOTE Limits: The subsurface safety valve is an emergency safety device@ and is not intended or designed for operational activities@ such as production/injection reduction@ production stop@ or as a backflow valve. Redress activities are beyond the scope of this International Standard@ see Clause 8.