Taigu Chang in foundry share with your basic knowledge of manhole covers: manhole covers are generally divided into round and square, in terms of urban highways offer manhole covers, manhole covers generally circular dimension, because round The covers easy to tilt, can better protect the safety of pedestrians and vehicles. If using a square, because it is significantly longer than the diagonal of the square on each side, when such covers are rolled on, it is easy to fall into the diagonally wells wellhead bearing manhole covers, pose a safety hazard. If the wellhead made of round or significantly smaller than covers manhole covers, square covers will not fall into the well. Manhole covers originally existed as noise, subsidence and other issues, and now with innovative technology, are also the perfect solution. Manhole covers can prevent loud noise, comply with environmental requirements. Taigu Chang in foundry ductile iron covers, each product through three processing procedures, the contact surfaces and manhole covers Manhole zero, so that the two can be 100% seamless fit, to eliminate noise when vehicles pass . Welcome to order our ductile covers! Size of manhole covers manhole covers _ _ northeast of foundry Chang Chang by Taigu in foundry. Taigu Chang in foundry (www.sxcnzz.com) strong, credible, in Jinzhong machining industry has accumulated a large number of loyal customers. The company better work attitude and continuous improvement of innovative ideas will lead foundry Chang into the brilliant and you work for a better future!