Downhole valve for preventing zonal cross-flow

One mobile control valve for underground well completion string of pipe, the first clamped between the control valve capable of high oil-producing. The control valve comprises of the room (33) shell (32), wherein the through hole is sleeved on the tubular members the shell (44), and a sleeve, wherein the tubular members is formed to the module (72) is (39). Serbia module comprises a reciprocal sleeve, a shaft of the tubular members (42). The production fluid is the tubular members through the through hole for the station house, and formed by (38) and corresponding through hole of the outer shell of the external plate to the control valve is. When the pressure the well completion string of pressure oil in the hydraulic pressure, wherein the closing of the capable of fluid is from well completion oil pipe connected to the tubular members.