Large-diameter pilot type high-pressure normally-open electromagnetic valve

The invention discloses a large-diameter pilot type high-pressure normally-open electromagnetic valve, and relates to the technical field of electromagnetic valves. The large-diameter pilot type high-pressure normally-open electromagnetic valve comprises a valve body, a piston assembly and an electromagnetic driving assembly. An inlet cavity, an outlet cavity and a main valve port are formed in the valve body, and the main valve port is used for communicating with the inlet cavity and the outlet cavity. The piston assembly is located on the top of the main valve port and used for controlling the main valve port to be opened and closed. The piston assembly comprises a piston fixing sleeve, a piston body, an ejector rod assembly and a normally-open spring. The piston body is movably connected with the interior of the piston fixing sleeve in a sleeved mode, and the piston fixing sleeve and the valve body are connected and fixed. A piston inner cavity, a main valve port sealing part, a guide valve port and a bala