The pressure safety valve of the mixing station, the clamp safety valve, the pressure relief valve of the cement tank, and the explosion-proof pressure safety valve at the top of the cement silo all belong to pressure safety protection devices. Their core function is to automatically release pressure through opening, preventing accidents such as explosion or rupture in powder storage silos (such as cement tanks and fly ash silos) or pressure pipelines due to abnormal increase in internal pressure (overpressure). At the same time, they also avoid negative pressure problems caused by excessively low pressure (some models can provide bidirectional protection).