1概述随着国民经济建设的蓬勃发展,对管道的输送能力及输送范围的扩大提出更高的要求。在大、中型矿山的生产中,除了输送单一状态物质外,如气态、液态或固态等状态的物品,还需要输送多种状态的混合型物质,如固态和液态及混合态的渣液。这种混合状态物质输送,增加了阀门设计制造 1 Overview With the vigorous development of the national economy, higher requirements are put forward on the transmission capacity of the pipeline and the expansion of the transmission range. In the production of large and medium-sized mines, in addition to transporting a single state substance, such as gaseous, liquid or solid state items, it is also required to transport mixed substances in various states, such as solid and liquid and mixed liquid slag. This mixed state of material delivery, an increase of valve design and manufacturing