Press Nominal (1) vacuum valve: the working pressure below the standard atmospheric pressure valve. (2) Low pressure valve: nominal pressure PN ≤1.6Mpa valve. (3) pressure valve: PN nominal pressure is 2.5Mpa, 4.0Mpa, 6.4Mpa valve. (4) high-pressure valve: nominal pressure PN is 10.0Mpa ~ 80.0Mpa valve. (5) high pressure valve: nominal pressure PN≥100.0Mpa valve. (6) Filter: PN nominal pressure is 1.0Mpa, 1.6Mpa 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 cryogenic steel castings JB / T7744-1995 valve sealing surface plasma arc welding alloy powder Tianjin Tanggu Valve Force brand valves, valve out of Hong Kong (certified), Zhuhai valve By Valve Co., Ltd., Dongguan Ming Kong. 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.