Pneumatic Flange Diaphragm Valve factory Our History ZHEJIANG ZHONGZHI VALVE GROUP CO., LTD. is manufacturer of Diaphragm Valve, Pneumatic Diaphragm Valve, Ball Valve, Fluorine-lined Butterfly Valve, Fluorine-lined Ball Valve, Limit Switch Box, Solenoid Valve and other valves. Over the past 10 years, our company has designed and manufactured a series products of international widely in petroleum industry, website:http://www.zzvalvecn.com/