Quick-closing valve disc anti-rotation structure for steam turbine

The utility model discloses a quick-closing valve disc anti-rotation structure for a steam turbine. The quick-closing valve disc anti-rotation structure comprises a valve disc and a fixing sleeve which are in threaded connection. A pin is further mounted at the joint of the valve disc and the fixing sleeve; one end of the valve disc sleeve is connected with the fixing sleeve through two anti-rotating pins; and the other end of the valve disc sleeve is fixedly connected with the valve cover through an internal thread cylindrical pin. By means of the structure, the anti-rotation function of the valve disc of the DN100-caliber quick-closing valve is achieved, the relevant requirements for the quick-closing valve in API612 are met, normal operation of a steam turbine is protected, and the situation that normal operation of a unit is endangered due to rotation of the valve disc is avoided. 本实用新型公开了一种蒸汽汽轮机用速关阀阀碟防转结构，包括螺纹连接的阀碟和固定套；阀碟和固定套连接处还安装有销钉；阀碟套筒一端通过2个防转销与固定套连接；阀碟套筒另一端与阀盖之间通过内螺纹圆柱销固定连接。本结构实现了DN100口径速关阀阀碟防转功能，满足