A hydraulic ram jet Well Control Device is an important component assembly, a flexible switching operation effort, the use of safe, simple maintenance characteristics. 
1, uses 
Casing string can be closed between the annular space, totally closed wellhead. In the closed cases, the four-way through the lower part of the shell or flanking the pipeline linking exports, drilling fluid circulation, festival exile jet, killing, and other operations. In exceptional circumstances, can be cut off drill reached purposes. BHA can be hoisted. The use of adjustable gate can be closed a range of different specifications of the pole and the casing annulus. 
2, structural features 
(1) of the structural features stand 
1) shape. General Shell approximate square, through the middle of the vertical through-hole drilling tools and horizontal movement of ram gate room. 
2) connectivity. From top to bottom of the three connectivity options: planting wire connections, flange connection, connecting closure device. Its connecting flanges, bolts, closure device, according to the size steel ring groove API standards implementation. 
(2) gate structure and the use of features 
Double-sided with ram, the ram on the following symmetry. BHA different sizes really only half replacement rubber seal ring and ram Press, and the remaining parts can be generic swap; unilateral use ram an overturned; shear ram wellhead drilling tool and can cut off the whole closure wellhead; can adjustable ram applicable to different sizes within a certain range of drill pipe and cap seal. 
(3) ram sealing characteristics 
Ram floating-gate automatic pressure wells sand and help letters, automatic gate in the gate and into the role since before Tasshi effective, namely: ram the top of the shell and sealed gate in front of the sealed tube, the shell and the door seals, the piston rod with the door closed. 
(4) gate locking device 
Locking devices manually rotating through human hands round of closed or locking gate. Caution should be taken when using manual locking device solely for the closed gate, we can not open the gate. After using the first to open the gate-to be reset manually locking device Unlock, and then open the hydraulic ram.