The sealing performance of the valve is the valve part of the sealing ability to prevent media leaks inlet valve, 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 will result in material losses, environmental pollution can also cause serious accidents. The explosive, toxic or radioactive medium, leakage is inadmissible valve price, therefore, the valve must have a reliable sealing performance. 1 \ operation of the valve should be intact, and the bracket flange bolts complete cast iron valves, screw lossless, no loosening. 2. The hand wheel is lost, should be filled and not be able to replace with a wrench. 3, packing gland is not allowed skew or no pretension clearance. 4. If the valve using the environment is more severe, vulnerable to rain, snow, dust, sand and dirt contamination, you should install a protective cover for the valve stem. 5, the scale on the valve should remain complete, accurate, clear and valves, valve seals, caps. 6, insulation jacket should be no dents, cracks. 13, the operation of the valve, to avoid its beat, or support heavy loads. Stainless steel valves, Hubei valve, the valve out of Hong Kong, the Hong Kong valve provided by the Dongguan Science and Technology Co., Ltd. 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!