... discharged from dump valves. Parameters Technical support Shanghai Zhengyuan Powder R&D Co., Ltd.Add:No.533, Yuanzhong Road, Industrial ... Park of Nanhui District,Shanghai,ChinaTel: (086)21-68015751 ... / 68015651 Fax:(086)21-68015117Weifang Zhengyuan Powder Engineering Equipment Co., Ltd.Add:No ...