A subsurface safety valve well tool securable in a well conduit for controlling flow of fluid through the bore of the conduit. An increase or decrease in the well pressure from the normal flowing pressure of the well operates a rotatable ball valve to block flow of fluid through the conduit. Increasing and then decreasing the pressure in the bore above the ball valve rotates the valve to enable flow of fluid through the conduit.
This is a division of application Ser. 1975, 566,202 filed Apr. 9, 1975 now Pat. No. 3,987,849 which is a continuation of application Ser. No. 399,455, filed Sept. 21, 1973 now abandoned which is a division of application Ser. No. 214,679, filed Jan. 3, 1972 and which issued on Jan. 29, 1974 as U.S. Pat. No. 3,788,594.
