Subsurface Controlled Subsurface Safety Valve 2 : A downhole safety valve designed to close when the flow rate reaches a preset level as measured by a pressure drop across a valve
George E. King Engineering, 5000 Oilfield Terms: A Glossary of Petroleum Engineering Terms, Abbreviations and Acronyms, US 2010. http://gekengineering.com/Downloads/Free_Downloads /Glossary_of_Petroleum_Engineering_Terms_25_August _2010.pdf, (Oil - Amer) {593}