Zhengzhou City Butterfly Valve Co.,Ltd is a hi-tech enterprise and a specialized factory that researches and manufactures middle and low pressure butterfly valve and special valve. It is a member factory of China Water Association, China Valve Association and Henan Quality Association, and is also a Zhengzhou patent example enterprise. The enterprise has won ISO9001, DNV , API and CE Certificate. We have been awarded national "A" grade security registration and won the license to import and export. The "ZhengDie" Brand products have been awarded many national patents and are recommended by China Water Association and China Petroleum as "Fine Goods". Our main products are: bi-directional metal or rubber seated butterfly valve,fluorine seated butterfly valve, hydraulic check valve, oil control slowly-closing butterfly check valve,metal hard seated ball valve,eccentric plug valve,stainless steel sluice gate, ventilaion valve,dismantling joint etc. The operation types have handle, worm gear operated, electric operated, pneumatic and hydraulic types. The nominal diameter is from DN 40mm to 4000mm. Their pressure class is from PN 0.01MPa to 6.4MPa. Our products can be widely used in all kinds of working conditions, such as drainage, power, chemical, metallurgy and building material.