FC gate valve is full bore design, which can effectively eliminate pressure drop and eddy current. Metal seal is used between valve body and cover, gate and valve seat, valve body and valve seat. The valve cover and valve stem are designed with back sealing, which is convenient to replace the valve stem sealing ring under pressure. The surface of valve plate and valve seat is sprayed with cemented carbide. It has good wear resistance and corrosion resistance. One side of the valve cover is provided with a sealing grease injection valve. In order to replenish the sealing grease. Improve the sealing and lubrication performance between the valve seat. Can be equipped with various specifications of drive device. The outlet can be divided into thread connection, clamp connection and flange connection.