This technology involves the field of environmental protection is a dedusting system for coke oven coke in the butt flap valve, the valve casing, adjusting flange slices. Coke oven coke dust removal system based in the traditional butt flap valve in the actual process of using this technique revealed deficiencies, targeted improvements can eliminate the error install horizontal and vertical degrees of each docking flap valve You can eliminate the retractable docking guide sleeve travel deviation, to ensure the guide sleeve with retractable butt butt butt tight flap valve, thereby reducing system leakage rate, improve the system efficiency.