Solenoid valve and assembly method therefor

A solenoid valve, comprising:

• a valve body assembly, wherein the valve body assembly is provided with a valve cavity and a main valve port configured to be in communication with the valve cavity, the solenoid valve further comprises a first iron core, a second iron core, a valve core assembly and a piston assembly disposed in the valve cavity, the first iron core is provided with a first cavity, the second iron core is provided with a second cavity, the piston assembly is configured to open or close the main valve port, and an end of the piston assembly away from the main valve port is provided with a guide valve port;
• and
• the valve core assembly comprises a sealing portion and a valve rod portion, the valve core assembly is movably in sealing fit with the guiding valve port via the sealing portion, one end of the valve rod portion is movably inserted into the first cavity and is configured to be stopped in the first cavity, another end of the valve rod portion passes through the second cavity and is connected to the sealing portion, and the sealing portion is configured to be stopped outside the second cavity.