Double-blocking-up type fixed ball valve

The utility model provides a double-blocking-up type fixed ball valve and relates to the technical field of ball valves. The double-blocking-up type fixed ball valve comprises a valve body. A medium flowing-in channel and a medium flowing-out channel are formed in the valve body and are communicated with each other through a middle cavity, one end of a valve rod is arranged outside the valve body, the other end of the valve rod penetrates through the valve body to be connected with a ball body arranged in the middle cavity, and a valve cover is further arranged on the valve body. The double-blocking-up type fixed ball valve is characterized in that an upstream valve seat is further arranged at the position where the medium flowing-in channel is linked with the middle cavity, a downstream valve seat is further arranged at the position where the medium flowing-out channel is linked with the middle cavity, a release valve is further arranged on the valve body, and sealing injection devices are further installed