... preventer type:2FZ1835, 2FZ1870,2FZ2835,2FZ 2870, 2FZ3535, ZFZ3570 and 2FZ5414 ram blowout preventer: double ram blowout preventertype:2FZ1835, ... 2FZ1870,2FZ2835,2FZ 2870, 2FZ3535, ZFZ3570 and 2FZ5414. Technical parameter1)bore size: 7-1/16"-26 ... a large, specialized valve used to seal, control and monitor oil and gas wells. Blowout preventers were developed to cope with ...