Hard sealed gate valves, also known as protective gate valves, are used in heating, civil defense engineering, and related pipeline networks. The valve body is made of ductile iron casting and coated with epoxy resin to prevent rusting and corrosion. As it is non-toxic and suitable for drinking water, it can also be used for drinking. The sealing surface of the valve body is made of copper alloy welding, which has good wear resistance and ductility, ensuring good sealing during use. The valve plate also uses copper alloy welding technology, which is less likely to cause jamming during opening and closing.

The valve stem is made of 2cr13 or B2 brass, and the fully automatic processing technology ensures the machining accuracy of each valve stem, ensuring that there will be no size differences or inflexibility during use. This greatly improves the opening and closing effect of the valve during its service life, reduces daily maintenance and replacement, and greatly reduces the cost of use and manual replacement for the user.

The leakage level of the hard sealed gate valve is Class D. To improve the sealing performance of the valve, the valve plate grinding process and the valve plate end face milling process are used to ensure strict coaxial concentricity, making the valve grade A or B standard.