我国在六十年代至七十年代，热油炉都靠进口，其配套的阀门也靠进口。七直年代末，八十年代初，我国自行设计有机热载体加热炉，其配套的阀门则由国家劳动部指定厂家生产。由于导热油易燃易爆，因此对阀门的质量要求也特别严格。国内生产的导热油阀门价格昂贵，因此有些使用单? China in the sixties to the seventies, hot oil stoves rely on imports, and its supporting valves are also imported. Seven straight age, the early eighties, China’s own design of organic heat carrier heating furnace, the valve supporting the Ministry of Labor designated by the manufacturer. As HTF is flammable and explosive, so the quality requirements of the valve is also particularly strict. Domestic production of thermal oil valve is expensive, so some use a single?