Arrow check valve is a kind of one-way valve with large pressure drop. The seal 

of the valve is arrow valve. Under the action of reverse circulation pressure and spring 

force in the drilling tool, the arrow valve closes quickly and cuts off the inner passage 

of the drilling tool, so as to prevent blowout in the drilling tool.It can be placed on the 

platform for standby, or it can be installed between the drill pipe and the drill bit after 

removing the jacking device to prevent high-pressure oil and gas from ejecting from 

the drill pipe.A special release tool keeps the valve in a normally open state, allowing 

reverse flow through. When the first blowout signal is found when the drill pipe is pulled 

out from the well, the blowout preventer can be quickly installed on the drill string.