ram blowout preventer: double ram blowout preventers type:2FZ1835, 2FZ1870,2FZ2835,2FZ 2870, 2FZ3535, ZFZ3570 and 2FZ5414 ram blowout preventer: double ram blowout preventerstype:2FZ1835, 2FZ1870,2FZ2835,2FZ 2870, 2FZ3535, ... wells. Blowout preventers were developed to cope with extreme erratic pressures and uncontrolled flow emanating from a well reservoir during drilling ram blowout preventer