Steam turbine inserting regulating steam valve base

The utility model relates to a steam turbine regulating steam valve base. This is a steam turbine inserting regulating steam valve base. At the contact place, external surface of the valve seat gets surfacing welded with the valve disc, using hard alloy. The utility model is characterized in that the valve seat is scarf-jointed in a valve casing. An elasticity groove is arranged at the inner ring of the valve seat at the contact place between the valve seat and the valve casing. The elasticity groove makes it easy for valve seat to get inserted in the valve casing. The utility model overcomes the problem that the process of existing entirety type valve seat lines of contact is difficult, and enhances process quality of the valve seat, and decreases cost of process and power consumption, and enhances security of steam turbine set, and can be applied to supercriticality 600MW steam turbine set.