Seal test with nominal value of the test pressure test, Shanghai and Shanghai Valve Manufacturing Co., Ltd., which is not less than twice the number in the specified time no leakage in compliance. Leakage test in two ways: First, the valve seal all joints, Guangzhou Kaiheng Valve Co., Ltd., with butter to seal tissue El posted on the flange, tissue muster the drain valve is not muster qualified; second is to use butter to a thin plastic plate or other plate attached to the lower part of the outlet flange seal, seal irrigation valve, test water bubbling is not qualified. Safety valve constant pressure and reseating pressure of not less than three times the number of trials, compliance is qualified. The performance of the valve test, see GB / T 12242-1989 safety valve performance test method. " We believe the most direct intuition is stainless steel valves never rust, will think that if we buy a rusty stainless steel valves, stainless steel that necessarily a problem. In fact, under certain conditions, stainless steel can also rust. Stainless steel has the ability to resist atmospheric oxidation, namely stainless steel, while also having the ability to corrosion in acid, alkali, salt medium, namely corrosion resistance. However, the size of the corrosion resistance of stainless steel with the chemical composition of the steel itself, environmental conditions and type of media used and change. Tianjin Tanggu valve limited liability company | Ming Kong valve (Online) | valve provided by the Dongguan Science and Technology Co., Ltd., the Hong Kong valve. Valve Co., Ltd., Dongguan Ming Kong (www.gdmgfm.com) is Dongguan, butterfly leaders, over the years, the company implement the scientific management, innovation and development, the principle of honesty and trustworthiness, and satisfy customer needs. Ming Kong valve leadership with the staff warmly welcome all inquiries negotiations to create a better valve out of Hong Kong in the future.