GB / T12242-2005 safety valve performance test method GB / T12245-2006 valve performance test method GB / T12251-2005 steam traps - Test method GB / T13927-2008 Universal valve pressure test JB / T5296-1991 common valve flow coefficient and Test Method for flow resistance coefficient JB inspection and testing JB / T6904-1993 cylinder valves / T7748-1995 valve cleanliness and measurement methods JB / T7927-1999 valve castings appearance quality requirements JB / T9092-1999 valve inspection and test test and inspection standards: GB / T13927-2008 Shanghai Guanlong Valve Machinery Co., Ltd. Tianjin Tanggu Watts Valve Co., Ltd. | Zhuhai 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!