Scald Protection Valve for Drench Showers, Eyewashes and Combination UnitsBradley Freeze and Scald Protection Valves may serve as primary protection on untraced systems or a fail-safe back-up for traced water systems. The scald protection valve activates at 85 F (30 C) and fully opens at 100 F (38 C). The scald valve closes at 85 F (30 C). These valves allow water to circulate inside the unit without getting too hot or freezing. Water drains from the valve outlet to the outside of the unit through a hose or piping. Max. pressure rating is 200 psi.