Pressure test methods of various valves under normal circumstances, Guangzhou Kaiheng Valve Co., Ltd., Industrial valves do strength tests in use, but after the repair of the valve body and bonnet or corrosion damage of body and bonnet strength test should be done. For safety valve, Shanghai and Shanghai Valve Manufacturing Co., Ltd., its tuning pressure and reseating pressure and other tests shall comply with the provisions of its specification and related procedures. Chang's strength and tightness test valve should be installed. 20% of the low-pressure valve checks, such as failure to be 100% inspection; in the high-pressure valve should be 100 percent inspection. Valve pressure test commonly used media are water, oil, air, steam, nitrogen, etc. Why the double sealing valve as a shut-off valve can not use? Advantages seat valve spool force balance structure, Guangzhou valve, allowing the pressure large, and it highlights the shortcomings of the two can not both be a good contact with the sealing surface, causing a large leak. If it artificially, mandatory for cutting off occasion, obviously not good, even if it made a lot of improvements (such as double-sealed sleeve valve), is also undesirable. Tianjin Tanggu valve limited liability company | Guangzhou 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!