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 by driving by driving classified into automatic valves, power-driven valves and manual valves driven by compressed air valves. Hydraulic valve: With oil liquid pressure driven valve. There are also more than a combination of several driving mode Tianjin butterfly doors, such as gas - electric valve. Press the nominal diameter (1) small size valves: nominal diameter DN≤40mm valve. (2) in size valves: nominal diameter DN is 50 ~ 300mm valve. (3) large diameter valve: Nominal valve DN is 350 ~ 1200mm valve. (4) King size valves: nominal diameter of the valve Tianjin DN≥1400mm valve gas valve _ _ out of Hong Kong Hubei valve valve valve provided by the Hong Kong Science and Technology Co., Ltd., Dongguan Ming. 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!