我厂汽轮鼓风机站主蒸汽管道隔离阀门均采用型号为Z41H-10、DN200、PN10MPa的闸板阀,其法兰密封形式为梯型槽钢环密封。在阀门安装投产后不久,先后有几只阀门与管道的法兰连接处出现了不同程度的蒸汽泄漏现象。由于当时生产紧张未能及时检修。几个月后在设备定期检修时发现管道一侧法兰的梯型槽密封面被蒸汽冲蚀出数条不同深度和宽度、形状不规则 I plant steam turbine blower station main steam pipe isolation valves are used for the model Z41H-10, DN200, PN10MPa gate valve, the flange seal in the form of a ring grooved steel ring seal. Not long after the valve was put into operation, there were several steam leaks at different degrees of flange connection of several valves and pipes. Due to the production of tension was not timely maintenance. A few months later, when the equipment was regularly overhauled, it was found that the sealing surface of the stepped groove of the flange on the pipe side was eroded by steam to several different depths and widths, and the shape was irregular