a multi functional assembly adaptable within a tubing string conduit to serve as a safety valve against the possibility of a blow out . both surface and subsurface controllable , it offers both a partially retrievable or totally retrievable system that allows unbiased and unlimited work over and wire line access to an entire tubing string and can provide safety for down hole well work . the preferred invention comprises a housing mandrel system including closure elements reciprocally mounted vertically within the safety valve conduit that when unengaged provides unrestricted flow and when engaged provides restriction amounting from limited flow to complete closure of a tubing string . the invention provides operational options to function hydraulically and mechanically while having the additional capability of being remotely controlled automatically , electronically , and manually . the hydraulic and mechanical activation systems of the safety valve can be set to operate individually , simultaneously and selectively within the housing mandrel conduit .