GB / T12225-2005 general copper alloy valve castings GB / T12226-2005 General Valve gray iron castings GB / T12227-2005 General Valve iron castings GB / T12228-2006 General valve carbon steel forgings GB / T12229-2005 General valve carbon steel castings 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 Toyama Valve Co., Ltd. of Taiwan, 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 DN≥1400mm Shanghai Guanlong Valve Machinery Co., Ltd. Shanghai and Shanghai Valve Manufacturing Co., Ltd. | Ming Kong valve (Online) | 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.