Assertion: modern blast furnace | /r/HasProperty | the bell valve top
Facets:
Source sentences:
text: At the time of production, from the top of the furnace (generally the top of the furnace consists of the material and the hopper, the modern blast furnace is the bell valve top and the bell-free top) is continuously loaded with iron ore, coke and flux, which is blown from the vent of the lower part of the blast furnace.