FT Type Drop-in Check Valve

FT type drop-in check valve is a kind of inside BOP (blowout preventer) in the drill string. It is simple in structure and easy to operate. When blowout is going to be happened, the thread connections of the Kelly are screwed out immediately and back pressure valve sub is put into the I.D. of drill pipe and then pumped downward to the required place. Thus the blowout accident can be prevented .Drop-in check valve consists of back pressure sub and check valve assembly. Back pressure sub is connected with top ring and tightened on and put into downhole with drill string, back pressure sub is used as a sub above drill string before check valve assembly is run above drill string before check valve assembly is run in dowmhole .