A thermostatic element inside the valve senses temperature and if this falls below the setpoint, the valve modulates open to allow flow. When the temperature increases to near the setpoint, the HAT valve modulates closed. HAT valves are available with built-in leakage to allow bypass flow.
- To control temperatures in glycol heat tracing systems, HAT valves will maintain the discharge temperature. When glycol temperature exceeds the setpoint, the valve will modulate closed. As heat loss occurs and glycol cools to below the setpoint, the valve will open to allow warmer glycol to circulate.
- HAT valves can act as freeze protection for condensate systems. HAT valves open when temperatures fall to allow condensate to discharge before freezing.
- In commercial aircraft, high temperature water can unexpectedly travel to the cold water lines. HAT valves on cold water lines will limit flow when excessive temperatures are detected, preventing scalding of passengers and crew.
- HAT valves used on tank heating coils limit the temperatures of the heating element. By closing before coil temperatures are too high, the HAT valves reduce the risk of over-temperature damage. In subcooling steam traps, HAT valves reduce problems associated with overheating.
- When used as a sampling system safety shutoff, HAT valves will remain open as long as sample temperatures are under the setpoint. If the sample temperature increases, the valve will shut off, protecting analyzing equipment from damage due to high temperature.
- Controls fluid return temperatures – ideal for glycol
- Maintains constant discharge temperatures
- Improved system efficiency
- Unaffected by pressure variations
- Stainless steel body, fittings, spring, and plug
- Corrosion resistant – long service life
- Exclusive Thermoloid® sensor/controller
- Most narrow temperature band available
- Compact low mass – fast response
- Two wrench flats for easy installation
- Ram-type plug for reliable shut-off