The headquarters of Zhejiang Zhongdong Valve Co. , Ltd locates at Linpu Road Dongou Industry Zone, Wenzhou, Zhejiang, China.
浙江中东阀门有限公司总部位于中国浙江温州东瓯工业区林浦路；
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Figure 3 is the internal structure of PGX model, and the filter is developed by Wenzhou Dongou Micro-Filtration Ltd. Company, which has achieved the national patent.