The causes of the hydraulic system trouble in the top of HY bell-valve blast furnac,and gives the detailed analgsis,at last obtains the resolution of the main hydraulic parts trouble in table.

• 叙述了HY型钟阀炉顶液压系统发生故障的原因，并对其作了详细的分析，最后得出了液压系统主要零部件的故障排除方法，并列表说明。