Safety valve and liquid cooling system

The utility model relates to the technical field of valves, in particular to a safety valve and a liquid cooling system. The valve body is provided with a valve cavity, an inlet and an outlet, the valve element can move in the valve cavity, the safety valve is provided with at least one sealing and limiting assembly, each sealing and limiting assembly comprises a first elastic sealing piece, a limiting groove, a sealing structure and a limiting structure, and the first elastic sealing piece is arranged in the limiting groove; the limiting groove is formed in the inner wall of the valve body, the sealing structure and the limiting structure are arranged on the outer wall of the valve element, and the sealing structure is located on the side, close to the outlet, of the limiting structure, or the limiting groove is formed in the outer wall of the valve element, the sealing structure and the limiting structure are arranged on the inner wall of the valve body, and the sealing structure is located on the side, close to the inlet, of the limiting structure. In a closed state, the first elastic sealing piece is extruded between the limiting groove and the sealing structure to form sealing; the valve element moves in the first direction to open the safety valve, the first elastic sealing piece is separated from the sealing structure to relieve sealing, and the limiting structure limits the first elastic sealing piece to move out of the limiting groove.