GB / T 1048-2005 standard Shanghai Guanlong Valve Machinery Co., Ltd. is a valve nominal identity is represented by a combination of the symbol "PN" and numbers can not be used to calculate the nominal purpose, the valve does not represent the actual measured values valves, nominal purpose is to establish specifications to simplify the number of pressure valves Shanghai and Shanghai Valve Manufacturing Co., Ltd., in the selection of Guangzhou Kaiheng Valve Co., Ltd., and design units, manufacturing units and users are to follow to this provision of data by the nearest The principle is the same purpose of establishing nominal size. Nominal divided European system and the American system. China's nominal pressure is to use the European system standards. 1, the valve should pay attention to the storage environment, should be stored in dry and ventilated room, and blocked both ends of the path. 2, the valve should be checked regularly and remove dirt on it, apply anti-rust oil coating on its surface. 3. Install the valve after application, should carry out regular maintenance to ensure proper operation. 4, you should check the valve sealing surface wear, and according to the situation for repair or replacement. 5, check the stem and stem nut trapezoidal thread wear, packing Obsolescence failure, etc., and replace as necessary. 6, to deal with the valve sealing performance tested to ensure their performance. Suzhou Watts Valve Co., Ltd., the Hong Kong _ _ 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!