communication between the passageways 41 and 67 this allows pressure differences across flapper 44 to equalize continued downward motion causes the shorter side of valve sleeve 42 to encounter and bear on tang 64 this forces flapper 44 to pivot open still further downward motion causes liner sleeve 53 to pass alongside the now raised lower surface of flapper 44 and engage upper end 60 of tubing 46 thus passageways 41 and 67 are then joined flapper 44 is trapped in the open position between the outer surface of liner sleeve 53 and an inner surface of valve sleeve 42 flapper 44 is out of the flow path thus there is no danger of hanging an intervention tool on flapper 44 as it is now isolated selective profile 43 is provided to allow a shifting tool to be latched onto power sleeve 18 should fluid pressure not suffice fluid communication through control line 34 be blocked or severed or there is otherwise some failure of the fluid to move power sleeve 18 the shifting tool can be run for example on coiled tubing wireline slick line or drill pipe to push or pull power sleeve 18 down or up to open or close valve 10 in the existing arts to open a flapper valve a flapper actuator commonly called a flow tube impinges on the flapper such that the flapper rotates away from the actuator the actuator pushes on the sealing side of the flapper swings the flapper open and passes beside the flapper to cover it and form an unobstructed flow path in conventional fill tube valves using a.