封隔器胶筒损坏
the damaged of packer rubber
三辊筒橡胶压延机
three roll rubber calender
双辊筒橡胶精炼机
two roll rubber refining mill
套筒式环空防喷器
annular blowout preventer
筒式防喷器
bag type blowout preventer
bag-type BOP
SBS单组分橡胶防水涂料
SBS single component rubber waterproof paint