Check valve for self-priming pump

The utility model belongs to the technical field of self-priming pumps, and relates to a check valve for a self-priming pump, the check valve comprises a valve cover and a valve seat which are hermetically connected, a valve rod seat is arranged at the axis of the valve seat, and the valve rod seat is connected with the inner wall of the valve seat through a plurality of connecting plates which are arranged at intervals. A water inlet of the check valve is formed by a gap between every two adjacent connecting plates, a water outlet of the check valve is formed by a gap between the valve cover and the valve seat after the valve cover moves upwards, a filter screen is arranged below the valve seat, the filter screen wraps the water inlet and isolates the water inlet from external water, and a filter cavity is formed between the filter screen and the water inlet. According to the check valve for the self-priming pump, the filter screen is additionally arranged to prevent solid impurities and particulate matter f