Inside blowout preventer tool
The inside blowout preventer manufactured by Jiangsu YOUYAO PETROLEUM MACHINERY CO.,LTD have kelly cock valve,arrow shaped check valve, drop-in check valve.
Kelly cock valve is divided into upper kelly cock valve and lower kelly cock valve.Upper kelly cock valve connects to the top of kelly;lower kelly cock valve connects to the bottom of kelly.Upper kelly cock valve is left-hand thread.Lower kelly cock valve is right-hand thread and the structures of them are the same which are all ball valve.
Both arrow shaped check valve and trap-in check valve belong to drill tool check valve.