henan liwei pipe equipment co., ltd.(the former zhengzhou liwei rubber products co., ltd.), located at shangjie district, zhengzhou city.is a manufacturer specializing in processing various steam, water, wind pipe expansion and compensation jooints , and a main base for producing ruber, metal and non-metallic pipe joints. it is also the appointed enterprise by the former chemical industry ministry, national construction ministy and general petrol chemical company, member unit of china water supply association and power equipment network union, and joints production unitrecommended by china waterassociation and national metallurgy ministry