1, the electrochemical corrosion. Stainless steel valve surface accumulating the attachments contain other metal elements or heterogeneous metal dust particles, in the humid air, condensate and stainless steel fixtures between the two together into a micro-battery, causing the electrochemical reaction, protective film damage. 2, stainless steel valve surface adhesion organic juice, Guangzhou Kaiheng Valve Co., Ltd., in the case of water oxygen conditions, valves, constitute organic acids, Shanghai and Shanghai Valve Manufacturing Co., long the organic acids on corrosion of metal surfaces. 3, stainless steel valve surface adhesion containing acid, alkali, salts, can cause localized corrosion. 4, in the air pollution (such as those containing sulfides, carbon dioxide, nitrogen oxide atmosphere), the case of condensed water to form sulfuric acid, nitric acid, acetic acid solution point, Shanghai Guanlong valve Machinery Co., cause chemical corrosion. Above may cause damage to the stainless steel surface protection film cause rust. Classification valve, the valve is a process by changing its internal channel cross-sectional area of ??the pipe line to control the flow of a medium mechanical products. 1, by purpose and function points: (1) cut-off valve class: cut-off valve, also known as closed valve, its role is to connect or disconnect the line of media. Z, J, X, Q, D, G, discharge valve, sampling valves, pinch valves. (2) to check class: Also known as the one-way check valve, its role is to prevent the line of medium back. H, bottom valve. (3) The shunt valve class: its role is assigned, split or mixed line of medium. S, dispensing valve. (4) control valve class: its role is to regulate the line of medium flow, pressure and other parameters. T, L, Y. (5) Safety valve categories: its role is to prevent the pressure medium means exceeds a predetermined value, so as to provide security protection for overpressure piping or equipment. Safety valve, breathing valve. Ningbo Ai Ke Valve Co. | valves | valve provided by the Dongguan Ming Kong, the Hong Kong Science and Technology Co., Ltd. valve. Valve Co., Ltd., Dongguan Ming Kong (www.gdmgfm.com) strong, credible, butterfly and other industries in Dongguan, Guangdong has accumulated a large number of loyal customers. The company better work attitude and constantly improving innovative ideas will lead valve and you work out of Hong Kong into the brilliant, for a better future!