Axial flow check valve adopting conical surface matching structure to ensure concentric precision

The invention belongs to the technical field of valves. An axial flow check valve comprises a valve body, a flow guide cover, a valve clack and a valve rod, wherein the inner cavity contour and the outer contour of the valve body are streamlined, a valve seat conical surface sealing surface, a valve rod sliding guide hole, a mounting conical surface matching part of the flow guide cover and the valve body are sequentially arranged on the valve body in the medium downstream direction, the valve clack, the valve rod and the flow guide cover are sequentially arranged in the inner cavity of the valve body in the medium downstream direction, and the contact surface of the valve clack and the valve seat conical surface sealing surface is a valve clack conical surface sealing surface; and the valve rod penetrates through the valve rod sliding guide hole to realize coaxial matching with the valve clack, the sealing surface between the valve rod and the valve clack is a conical surface, and theflow guide cover and the