The A46F/Y pilot operated pressure relief valve is a novel safety valve structure. It is mainly used in the fields of petroleum weather, chemical industry, power, metallurgy, and urban gas, and is a preferred overpressure protection device for pressure equipment, containers, or pipelines. The main advantage of the pilot operated pressure relief safety valve produced by Shanghai First Ring Road is that it changes the direct action of the spring to the indirect action of the pilot valve, which improves the sensitivity of the action. In addition, the main valve of the 46F/Y pilot operated pressure relief safety valve adopts a sleeve piston type and a double sealed valve seat structure, which has high action accuracy, good repeatability, fast reseating, no leakage, can carry high back pressure discharge, long working life, stable and reliable operation. The 46F/Y pilot operated pressure relief safety valve can also be calibrated online and can automatically reseat after repeated opening and jumping discharge, with strict closing and easy operation and maintenance.