Subsurface safety valve

A subsurface well safety valve for use in a well flow conductor, including:

• a tubular valve housing having means for securing in a well flow conductor at a subsurface location in a well, said housing having a bore formed therethrough in flow communication with the flow conductor for enabling production of hydrocarbons from the well;
• a flow closure element disposed in said bore for movement to and from a first position blocking flow of fluid through said bore and a second position enabling flow through said bore;
• operator means disposed in said bore for moving said flow closure element to and from the first and second positions, said operator means having a pressure responsive surface exposed to a control fluid for moving said flow closure element to the second position in response to the application of control fluid pressure to said pressure responsive surface;
• urging means mounted with said tubular housing for urging said operator means to move said closure element to the first position for blocking flow of fluid through said bore;
• said closure element pivotally connected to said tubular valve housing for rotation about said pivotal connection to and from the first position and second position;
• said closure element operably connected to said operator means for pivoting said closure element about said pivotal connection in response to movement of said operator means;
• seat means fixed in said bore and sealingly engageable with said closure means in the first position for blocking flow of fluid through said bore;
• said closure element in the second position pivoted outwardly of said seat means to enable said operator means to isolate said flow closure element from the flow of fluids wherein said closure element is protected when in the second position enabling flow of fluid through said bore;
• and
• said operator means includes a tubular assembly reciprocally movable within said bore, said tubular assembly having a flow tube for isolating said closure element in the second position from the flow of well fluids.