A46Y/F pilot-operated safety valve/pilot-operated safety relief valve is a safety valve with a novel structure. Mainly used in the fields of petroleum and natural gas, chemical industry, electric power, metallurgy and city gas, it is an overpressure protection device on pressure equipment, containers or pipelines. Its main advantage is that the direct action of the variable spring is the indirect action of the pilot valve. The sensitivity of the action is improved, and the main valve adopts the sleeve piston type, which has high accuracy of action, good repeatability, high return pressure, good sealing performance, high back pressure discharge, stable and reliable work, online adjustment, operation and maintenance convenient.