DIN3352F4Metal sealed gate valve: The valve body material is ductile iron GGG50, and the connecting parts are processed by a gate valve special machine. Both the inside and outside are treated with spray coating to achieve rust prevention. All are coated with electrostatic spraying, which makes the paint surface less prone to peeling and has high smoothness. The sealing surface of the gate is processed once, followed by a copper welding process to weld a layer of copper on the sealing contact surface, and then processed again to improve the hard sealing effect according to the softness of the copper. The process is slightly more complex, so the price of metal sealed gate valves is higher. The heat resistance and wear resistance are better than those of soft sealed gate valves, but the sealing performance is slightly worse than that of soft seals. Hard sealed gate valve is a universal type of valve widely used in fluid control in industries such as petroleum, chemical, and metallurgy. Hard sealed gate valves have the characteristics of low resistance, good sealing performance, and strong cutting ability, and are one of the indispensable infrastructure in the industry.