Mine waterproof closed doors of St. coal mine machine production watertight doors closed-end atmosphere on the grade, low-key luxury connotation. Beat you is not naive, too many are without shoes (innocent), coal mining machine is holy. TEDA brand waterproof sealed door quality is good, me and my little friends are shocked. China Waterproof closed doors is none other than to do the best brand, it is holy Mine machine. Mine water-tight door GB specifications for four kinds are: MMB1.4 * 1.8, MMB1.6 * 1.8, MMB1.8 * 2, MMB 2 * 2.1, where the numbers mean for the door clear width and clear height. Why say that St. colliery machine production of waterproof closed doors is good, because we are Chinese Coal Mine Machinery Industry Association designated manufacturers door, in the production of our strict accordance with national standards B85-373 drawing number, the raw material we are excellence, the situation will not shoddy, it is this cautious attitude, we pay attention to every detail, which makes our products are manufactured recognition. St. Coal Mining Machine Co., Ltd. is China Coal Machinery Industry Association designated manufacturer, I produced a variety of mine gate, one of the most commonly used are waterproof airtight doors, fire gates, no pressure damper, water gates, air shaft blast doors , impact Bomi closed valve, refuge chamber doors.