An annulus subsurface safety valve for installation between inner and outer concentric members and controlling a fluid passageway therein in which the safety valve is locked to the outer member when the fluid passageway is closed.SAFETY VALVES The outer member is provided with a threaded section and the safety valve housing includes a plurality of segments carried for inward and outward movement in which the segments include threads on the outside for coacting with the threaded section.Globe Valves A lock is provided upon the valve closure of the safety valve and positioned to be out of engagement with the segments when the valve is in the open position but is in engagement with and locks the segments outwardly in engagement with the threaded section when the valve is in the closed position.Balance Valves Springs urge the segments outwardly whereby the valve may be ratcheted downwardly into the threaded section and can be released from the threaded section by opening the passageway or can be released by rotation. A metal packing seal around the housing seals against the outer member and is provided with a piston for compressing the packing when exposed to pressure between the members.

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