Piston assembly and electromagnetic valve

The utility model provides a piston assembly and an electromagnetic valve, the piston assembly comprises: a piston, the piston is provided with an accommodating groove, and the bottom wall of the accommodating groove is provided with a riveting through hole; the check ring is located in the containing groove, the check ring is arranged around the riveting through hole, the two faces of the check ring are an abutting face and a riveting face respectively, and the abutting face abuts against the bottom wall of the containing groove; the riveting seat comprises a main body and a riveting ring arranged on the end face of the main body, the riveting seat penetrates into the riveting through hole and the check ring, the end face of the main body is located between the abutting face and the riveting face, and the riveting ring penetrates through the check ring and is in riveting fit with the riveting face. By the adoption of the scheme, the end face of the main body is located between the abutting face and the rivet