Founded in 1988,Wenzhou Longwan DONGHAI butterfly valve Co.,Ltd, was formerly Yongchang DONGHAI butterfly valve factory。 After 20 years of continuous innovation and development, DONGHAI with the subject to participate in research, develop, manufacture and sales of valves, especially for the butterfly valves. Main products include multi-layered metal seated butterfly valve, soft seated butterfly valve, ventilation butterfly valve, extension butterfly valve,........