Water valve HAT/SP

thermal

The HAT/SP self-operating scald protection valve is designed to protect personnel from scalding hot temperatures being released from safety shower and face or eyewash stations. Operation The HAT/SP scald protection valve should be installed at the highest point on an emergency safety station to continuously sense and automatically bleed off the excessively hot water. Depending on installation orientation, the thermal actuator at the heart of the valve will sense either the ambient or fluid temperature. It will modulate the valve open to establish flow if the temperature is above the valve’s set-point. Cooler water from the supply will backfill the line and cause the valve to modulate closed once the water temperature falls to 10°F below the open set-point. When installed in the ambient sensing position (standard flow), the thermal actuator will respond to atmospheric temperature changes to initiate flow and then respond to water temperature once flow is established. More conservative choice Opens sooner than fluid sensing on dropping temperatures More tolerant of dirty water Good choice for warmer climates The actuator will always respond to the water temperature when installed in the fluid sensing position (reverse flow). Used as a backup with insulated piping or heat tracing Ideal for colder climates Results in less nuisance dumping/draining