Liu Hu

Superelevation tamponade formula shutoff leather cup

Superhigh pressure tapping machine

Bits device is swept to stopper formula shutoff head

Novel downward plugging device

Novel plugging device

Ultrahigh-pressure drilling machine

Small -bore pipeline under pressure presses plugging device in area

Stifled ware under high pressure leakage prevention point type

Chipping sweeping device of plug type sealing head

Ultrahigh pressure plug type blocking cup