A46Y (F) piloted safety relief valve is a novel structured safety valve. Mainly used for oil, gas, chemicals, electric power, metallurgy and city gas fields, is the best overpressure protection device for compression equipment, containers or pipelines. Its main advantages are: the spring direct role is changed to the pilot valve indirect role in enhancing the sensitivity of the action; the master valve uses the sleeve valve piston, with double seal valve seat structure, having the following features: movement of high accuracy, repeatability, and faster back seat, not leaking, backpressure high energy band emissions, long working life, stable and reliable work; it can also adjust online; after repeated emissions, it still can automatically return to the seat; closed tightly; convenient operation maintenance.