GB / T 1047-2005 standard, the valve nominal diameter just a logo, represented by a combined symbol "DN" and numbers do not represent actual nominal size of the valve diameter value of Tianjin Tanggu Watts Valve Co., Ltd., the actual diameter of the valve value consists of the standard provisions related to Taiwan Toyama Valve Co., Ltd., general found (in mm) not less than 95% of the nominal value of size. Nominal size fraction Metric (symbol: DN) and imperial (symbol: NPS), GB valves metric, the US standard valve to English. Pipeline valves are controlled fluid delivery system components, which is used to change the channel section and flow direction of medium Shanghai Guanlong valve Machinery Co., Ltd., with diversion, turned off the throttle, check, diversion or overflow relief functions . Valves for fluid control valves, valves off from the most simple to the most complex automatic control valve used in the system, and its many varieties and specifications, the valve nominal diameter from large to tiny instrument valve diameter up to 10m industrial pipeline valves. EHV can be used to control the water, steam, oil, gas, mud, corrosive media, liquid metals and radioactive fluids and other types of fluid flow, the valve working pressure from 0.0013MPa to 1000MPa, the working temperature from 1430 ℃ ultra-low temperature to a high temperature of -270 ℃ of. Taiwan Toyama Valve Co., Ltd., the Hong Kong valves (online consultation), the valve provided by the Dongguan Science and Technology Co., Ltd., the Hong Kong valve. 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.