Patent for a new and improved pump for refrigerators. This design consists in "[t]he combination, with the cylinder, having inlet at or near its lower end, a downward-closing valve at its upper end, an open-ended piston having internal ribs or projections, annular valve-seat around its upper open end, and a centrally-apertured bottom plate, of the valve having vertical movement within the piston and closing upwardly against the valve-seat, said valve being formed of the two sections . . . having hemispherical recesses and the lower section having an aperture, communicating therewith" (lines 30-42).