Public GB / T1047-2005 piping element DN GB / T1048-2005 piping components nominal GB / T11698-2008 Marine flanged metal valve structure length GB / T12220-1989 Universal Valve logo GB / T12221-2005 flange connection metal valve structure length GB / T12222-2005 Multi-turn valve actuator connected to GB / T12223-2005 part of the rotary valve actuator connected to GB / T12225-2005 general copper alloy valve castings GB / T12226-2005 General Valve gray iron castings technical conditions GB / T12227-2005 General Valve iron castings GB / T12228-2006 General valve carbon steel forgings GB / T12229-2005 General valve carbon steel castings Shanghai Guanlong Valve Machinery Co., Ltd. Guangzhou Kaiheng 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!