热风阀是高炉生产的关键设备之一,由于启闭频繁,须承受一定的热疲劳应力,还要求能耐1000～1300℃甚至更高的热风温度,以及0.1～0.5MPa的风压。它的技术性能和使用寿命对高炉生产有着密切的关系。然而,直至70年代末,我国高炉使用的仍然是陈旧落后的老式热风阀。老式热风阀不耐高温高压,密封性差,使用寿命短,在风温风压较低的条件下(1000℃、0.2MPa),平均寿命也仅为3～6个月。 Hot air valve is one of the key equipment in blast furnace production. Due to frequent opening and closing, hot-air valve is subject to certain thermal fatigue stress, and also requires hot air temperature of 1000 ~ 1300 ℃ or higher, and wind pressure of 0.1 ~ 0.5MPa. Its technical performance and service life are closely related to blast furnace production. However, until the late 70s, the use of old blast furnace is still the old-fashioned old-style hot air valve. The old hot air valve is not resistant to high temperature and pressure, poor sealing, short service life, the air temperature under low pressure (1000 ℃, 0.2MPa), the average life expectancy is only 3 to 6 months.