Pressure relief device

The utility model relates to the technical field of pressure relief of reaction kettles, and discloses a pressure relief device which comprises a support, a glassware is fixedly mounted at the top of the support, a mounting plate is fixedly mounted on the outer side of the glassware, and a storage rack is fixedly mounted at the top of the mounting plate. A pressure monitor located on the right side of the glassware is fixedly installed on the top of the storage rack, a probe extending into the glassware is fixedly installed on the left side of the pressure monitor, a cover plate is fixedly installed on the top of the glassware, and a pressure reduction block is fixedly installed on the top of the cover plate; and a T-shaped buffer groove is formed in the pressure reducing block, the right side of the pressure reducing block communicates with a guide pipe extending into the cover plate, and a pressure spring is fixedly installed on the left side wall in the T-shaped buffer groove. The pressure relief device is