Pressure: 20000-200000psi Power: Manual Material: AA, BB, CC, DD, EE, ... is the necessary device of controling overflow and blowout, enforcing oil and gas well pressure control technique ... pressure will be broken, causing overflow and blowout. When the polluted drilling fluid or hydraulic ... can be maintained in the situation of closing blowout preventer. Besides, Flexible choke&kill device can be ...