Pressure setting device for main steam safety valve

The utility model relates to the technical field of nuclear power maintenance, and particularly discloses a main steam safety valve pressure setting device which is characterized in that a pneumatic pump is connected with a distributor A through an air source pipeline, two paths are led out from the distributor A and are respectively connected with a distributor B and a distributor C, and then two paths are led out from the distributor B and the distributor C and are connected with four wrenches; a regulating valve is arranged on the air source pipeline between the pneumatic pump and the distributor A; a branch pipe is led out of the gas source pipeline behind the regulating valve and is connected with a pressure gauge; the rotating ring sleeves the outer side of the fixed ring, and the rotating ring and the fixed ring are concentric and can rotate relatively; the four wrenches are fixed on the rotating ring at equal intervals, and wrench sleeves extend into the inner side of the fixed ring; when the pressure