The hot blast stove of blast furnace is the equipment that provides high-temperature hot air (about 1300 degrees) for blast furnace. A blast furnace hot blast stove generally has 2 ~ 4 hot blast stoves to ensure uninterrupted supply of hot air to the blast furnace. Among them, valves are divided into three categories according to their functions. One category is cut-off valves, such as hot air valves, cold air valves, flue valves and gas-gas cut-off valves. The other is to adjust the air volume and pressure, such as gas-air regulating valve and gas pressure reducing valve. The third is pressure balance. When the valve is opened, the pressure on both sides needs to be basically the same, such as a cold air pressure equalizing valve. According to the types of valves, there are gate valves (such as hot air valves), butterfly valves (such as three-eccentric and three-bar butterfly valves), ball valves (such as pressure equalizing ball valves and pressure relief ball valves) and disc valves (such as disc pressure relief valves). They all play different roles. In addition, a valve, such as flue valve, can choose various forms, such as hot air valve, gate valve, three-bar butterfly valve, disc valve and so on. , depending on the furnace capacity.