A valve diaphragm for a relief valve may include: a body having a first beaded end and a second beaded end, the first beaded end having a bottom surface and a bulge extending from the bottom surface. The bottom surface may be configured to contact a first portion of a corner of a lower valve body, and the bulge is configured to contact a step of an upper valve body, and the engagements of the bottom surface, the first portion of the corner, the bulge, and the step may be configured to create a fluid tight seal between the upper valve body and the lower valve body.