DH-SSSV Subsurface Safety Valve  Application  Apply for oil & gas well to close the well emergency when pipeline abrupt and irresistible natural hazard occur,Website:http://www.dhpetrotools.com, to avoid well blowout and ensure safety.  Feature  • Apply pressure from the control pipeline to open safety valve, relief pressure to close safety valve.  • Operate convenient,safety and reliably.ParameterOD.(in)ID.(in)Length(in)Temp.(℉)Pressure(psi)Well depth(m)Thread(in)5.122.3161.422507000≤5002-7/8 EU