It is made of high quality gray cast iron or nodular cast iron and stainless steel. The sealing surface is inlaid with copper strip or rubber. After precise processing, it can achieve plane contact seal with good sealing performance. When the sealing performance decreases, it can be solved by adjusting the wedge device. Cast iron brass-inlaid square gate 1. Cast iron brass-inlaid square gate consists of gate frame, gate plate, guide rail, sealing strip, transmission screw, hanger nut/lug and adjustable sealing mechanism. The gate frame and gate plate are made of high-quality gray cast iron or ductile iron. The guide rail is symmetrically arranged and connected with the two ends of the gate frame with positioning pins of stainless steel BOLS (for small and medium-sized gate, its guide). The rail can be poured into the door frame. The length of the guide rail is generally 1/2~1/3 of the gate opening height. Therefore, the whole structure has high strength, high rigidity, wear resistance, good corrosion resistance and high bearing capacity.