After more than eight years development, Wenzhou Renyi flange Co. , Ltd.  business demand is increasing day by day, in order to meet the demand,Wenzhou Qingyan Technology Co. , Ltd. was established, the company’s business scope is extended to the R & D, production, sales and service of flange. QingYan  mainly produces stainless steel flange, duplex steel flanges, super duplex steel flange, Nickel based alloy flange，Titanium flange，Stainless steel fittings and a series of products.The company has strong technical force, has a group of experienced engineers and technical personnel, the products implement international standards...