Zhejiang Dongsen Valve Co., Ltd., a member of China Valve Industry Union, is an enterprise integrating valvesĄ¯ research, design, manufacturing and sales with ISO9001 authentication. We are located in southeast Zhejiang Province, 500 kilometers from Shanghai, 300 kilometers to Ningbo Port, 80 kilometers to Wenzhou Port and 30 kilometers away from Wenzhou Airport. We really enjoy convenient transportation networks. W..