Well safety and kill valve

Claim 1

A valve device for use in tubing above a packer set in casing above a formation in a well comprising: a. a housing connectable in well tubing and having a longitudinal flow passage therethrough and a flow passage through said housing wall intersecting said longitudinal flow passage; b. an operator, including an upper operator tube, having a piston thereon, said piston sealingly engaging said housing and forming a variable volume chamber therewith, a lower operator tube connected to said upper operator tube, said operator tubes mounted for longitudinal movement in the housing, and a spring disposed around said upper operator tube in said housing between a shoulder in the housing and said piston; c. an upper sleeve valve, controlling flow through the wall flow passage between the valve device exterior and the longitudinal flow passage, including a resilient seal in the housing below the wall flow passages, sealingly engaging the lower operator tube and at least one port in the lower operator tube; d. a lower ball valve controlling flow through the longitudinal flow passage, having upper and lower seats and a valve ball member therebetween, said seats slidably sealed at substantially equal diameters in the housing and sealingly engageable with the valve ball member at seal diameters larger than said equal seat-housing seal diameters; and e. a releasable lock in said housing, for locking the lower valve closed after upward movement of the operator, closing said lower valve and opening the upper valve, said lock including a profiled recess in the housing, at least one dog pivotally mounted in an extension of the lower valve upper seat and profiled to engage said housing recess, a spring biased dog expander slidably mounted in said upper seat extension, said lock releasable during downward movement of the operator opening said lower valve and closing said upper valve.