Large-caliber pilot-operated high-pressure normally-open electromagnetic valve

The utility model discloses a large-caliber pilot-operated high-pressure normally-open electromagnetic valve, which relates to the technical field of electromagnetic valves and comprises a valve body,a piston assembly and an electromagnetic driving assembly, an inlet cavity, an outlet cavity and a main valve port for communicating the inlet cavity with the outlet cavity are formed in the valve body, and the piston assembly is positioned above the main valve port and is used for controlling the opening and closing of the main valve port; the piston assembly comprises a piston fixing sleeve, apiston body, an ejector rod assembly and a normally open spring, the piston body is movably sleeved with the piston fixing sleeve, and the piston fixing sleeve is fixedly connected with the valve body; the piston body is provided with a piston inner cavity, a main valve port sealing piece, a guide valve port and a balance hole, wherein the guide valve port and the balance hole are communicated with the piston inner cavity.