Gu Chang advantage in foundry ductile iron covers: 1, appearance design can be changed according to customer requirements, and then sprayed black asphalt, making products look bright, clean and resistant to oxidation heavy security covers, corrosion-resistant. 2, excellent material ductile iron manhole cover theft double QT500-7 material, increasing the density of security covers the product, so that the product has a strong compressive, flexural, impact, heat, cold, wear-resistant, acid , anti-aging, easy deformation characteristics. Welcome to choose Gu Chang in ductile iron foundry covers! Gu Chang-year foundry share before installing manhole covers preparatory work to be done with you: 1, to understand the connection ductile iron covers installation requirements: Before the construction of pipes, fittings, rubber ring, and so do a visual inspection and found the problem can not be used. 2, remember the following installation sequence: Clean jack socket on the apron → → → cleanup apron down tube (calandria) → appearance on the socket and apron brush lubricant → pushing to make the insertion tube socket → Check. Security covers pictures, Chang-year foundry (certified), Shuozhou security covers provided by Gu Chang in foundry. Gu Chang-year foundry (www.sxcnzz.com) is Jinzhong, machining leader, over the years, the company is implementing the scientific management, innovation and development, the principle of honesty and trustworthiness, and satisfy customer needs. Chang-year leadership in the foundry staff warmly welcome all inquiries negotiations to create Chang foundry in a better future.