Tiansheng is a network supplier for China National Electric Power Corporation , a network supplier of Sinopec , a network supplier for Petro China Company Limitied,A class AAA enterprises of Industrial and Commercial Bank of China, as well as a member enterprise of China Valve Grild ,We have import &export license ,ISO9001-2000(CQC) certificate from DNV, API6D certificate and National Manufacture License of Special Equipment (AZ),one of the top 30pump and valve manufactures in Wenzhou.