Valves for fluid control systems, from simple shut-off valve to a variety of highly complex automatic control valves used in the system, which is quite wide varieties and specifications. The valve can be used to control the flow of air, water, steam, corrosive media, mud, oil, liquid metals and radioactive fluids and other types of media. Valve is also divided into cast iron valves Shanghai Valve, cast steel valves, stainless steel valves (201,304,316, etc.), chromium-molybdenum steel valve, chromium molybdenum vanadium steel valves valve company, duplex steel valves, plastic valves, non-standard depending on the material and other customized valve material. The sealing performance of the valve is the valve part of the sealing ability to prevent media leaks, it is the valve of the most important technical performance indicators. Sealing valve has three parts: opening and closing pieces and valve seat sealing surface contacts between the two; and with the Department filler stem and the stuffing box; junction body and bonnet. Which is called before a leak within the leak, which is commonly known as Guan lax, it will affect the ability of the valve cut off media. For the truncated valve, the internal leakage is not allowed. Leakage after the two called the leak, that media leaks from the valve to the valve outside. Leakage would cause material loss through the valve, pollution brand valves, can also cause serious accidents. The explosive, toxic or radioactive medium, leakage is allowed, and therefore, the valve must have a reliable sealing performance. Shanghai and the valve, the valve out of Hong Kong (certified), Jiangxi 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.