Adopt the double gate seal structure of support type, open and close flexibly, the special central shaft structure makes the gate spin in the process of opening and closing, has the function of polishing and self-cleaning, the gate is closed with two-way sealing, good air tightness;Commonly used in dry ash system, slag slurry and other media conveying system, with less ash accumulation, no jam, simple maintenance, service life master and other advantages.