Zhengzhou Dayu Machinery Co., Ltd. is a leading mining machinery supplier in China, was established in September 1992, Headquarters is located at Zhengzhou, Henan Province, China. Covering above 18, 000 square meters and registering capital of RMB 50 million. Dayu supply drilling rigs and air compressors base on ISO9001,ISO14001management systems, and are CE,GOST certified.