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1)we are professional manufacturer of air dryers, air filters, filter elements, water separators and other air purification equipment 2) our product have CE certification and pass ISO9001:2000 quality system. 3)with the more than 17 years experience, we are sure to provide you the best service and the best quality products 4)As a director member of\"Branch of the China Universal Mechanical industry association of gas purification\" Risheng was honored to participate in compiling and drawing the industry standard for \"JB/T10526-2005 generally use Refrigeration Compressed Air Dryers\", \"JB/T10532-2005 generally use Regenerative Compressed Air Dryers\" 5)On December 12, 2007, as a production declared company of compressed air drying and purification equipments with \"Risheng\" brand, \"Hangzhou Risheng Decontamination Equipment Co., Ltd\" is the first company in China that got the production license which enacted formally by \"national industry production license office of the underling of the quality testing head bureau\"the number of the license is XK06-010-00074. 6)Quality is the top priority, so we always pay attention to the standardization of production and making perfect its quality management system unremittingly. In 1994, we were ev aluated as \"State Hi-tech Enterprise\" jointly by Zhejiang Provincial Committee of Science and Technology and Hangzhou Committee of Science and Technology, the only one in compressed air purification sector in Hangzhou city. In May 1998, Risheng became the first company to get ISO9001 Quality System Accreditation both domestically and internationally in the compressed air purification sector in China. 7) choose our product is your best choice.