Subsurface Safety Valve 2 (SSSV) : A device installed in a well below the wellhead with the design function to prevent uncontrolled well flow when actuated. (PR 14C)
The Mudblogger (Oilfield, Energy and Related Photographs), Oil Field Glossary, TX, USA 2014. http://mudblogger.com/oilfield-glossary/, (Oil - Amer) {777}