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 GB / T12230-2005 General valves austenitic steel castings JB / T5300-2008 industrial valves material selection guidelines JB / T6438-1992 valve sealing surface plasma arc welding technical requirements JB / T7248- 2008 Valve steel castings with low plasma arc JB / T7744-1995 valve sealing surface surfacing alloy powder Taiwan Toyama Valve Co., Ltd. Guangzhou Kaiheng Valve Co., Ltd., the Hong Kong _ valve (Online) _ Dongguan valve valve from Dongguan Ming Kong Technology Limited. 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.