Abstract: A pressure relief valve particularly suitable for fluid compressors includes a valve seat and a flexible valve closure element cooperating therewith. The closure element, formed from a single sheet of spring steel or similar flexible material, includes a planar portion normally overlying the valve seat to keep the valve closed, and a pair of flexible arms joined at one edge of the planar portion and extending around either side of the planar portion and beyond the opposite edge. In position, the remote ends of the arms are fastened to the supporting structure in a plane common with the valve seat, with the planar portion overlaying the valve seat and closing the valve orifice.