Fluorine lined check valve valve flap is disc-shaped, rotating around the axis of the valve seat channel, because the valve channel into a streamlined, flow resistance is smaller than the rise of butterfly check valve, suitable for low flow rate and flow of infrequent changes in the large caliber occasions. Product drive mode can be selected without drive, connection mode can be selected flange, structure form can be selected lift type, sealing structure can be selected soft seal.