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我厂的N12—35型汽轮机中,单向关闭汽阀套筒的内外圆直径要求严格,制造精度高.表面粗糙度达R_α1.6,而且其内孔太长(l=270mm),见图1。
In the N12-35 steam turbine of our factory, the inner and outer diameters of the one-way closed steam valve sleeve are strict with high precision and the surface roughness reaches R_α1.6, and the inner hole is too long (l = 270mm) 1.