梅山烧结厂于1984年12月26日利用计划检修时间对焦炉煤气进口管道阀门作了改进。烧结厂进厂焦炉煤气管道口径为Dg400,原设计用两道Dg250蝶阀串联调节控制,其中一道早已弃之不用,设计阻损为每道阀50毫米水柱,因此,焦炉煤气进烧结厂时在这里有较大的压力损失,这次改进将原两道Dg250蝶阀改为一道Dg300蝶阀,阀 Meishan sintering plant on December 26, 1984 using the planned maintenance time on the coke oven gas pipeline valves made improvements. Sintering plant into the coke oven gas pipeline diameter Dg400, the original design with two Dg250 butterfly valve in series regulation and control, one of which has long been abandoned, the design resistance loss of 50 mm per valve water column, therefore, coke oven gas into Sintering plant Here there is a greater pressure loss, the improvement will be the original two Dg250 butterfly valve butterfly valve Dg300