An E.M.M.I. Valve is a special type of hatch found in E.M.M.I. Zones in Metroid Dread. They seal the entrances to narrow tunnels in the zones and open only for the E.M.M.I., which use them as shortcuts.
After Samus defeats an E.M.M.I., all E.M.M.I. Valves in its zone permanently open for her to explore the tunnels using her Morph Ball and cease to be marked on the map. Because E.M.M.I.-01P and 02SM cannot move through narrow spaces, no valves of this type are present in their zones.