Price: Contact us for purchase info: (877) 379-8258

SKU: 144 Series (1/2") 145 Series (3/4")

Notes: See product sheet for available sizes and temperatures.

Product Description

HAT/RA Product Sheet
HAT/RA Installation and Maintenance Instructions


  • Controls cooling fluid return temperatures – ideal for glycol and water
  • Maintains constant discharge temperatures
  • Improves system efficiency
  • Unaffected by pressure variations
  • Conserves water

Design Features

  • Stainless steel body, fittings, spring, and plug
  • Corrosion resistant – long service life
  • Operates in narrow temperature band
  • Compact low mass – fast response
  • Two wrench flats for easy installation
  • Ram-type plug for reliable shut-off


As the fluid temperature increases to within the operating range of the HAT/RA, the thermal actuator modulates the valve open. If the fluid temperature is above the acceptable range, the valve will continue to modulate open allowing additional fluid discharge. As the outlet temperature falls, the valve then modulates toward the closed position, reducing flow. This modulating action maintains a relatively constant fluid temperature even as operating conditions vary.

Typical Applications

The HAT/RA reverse acting valve may be used to regulate the flow of cooling water, glycol or other cooling media in applications requiring economical removal of heat from equipment or a process. Since the HAT/RA valves open on rising temperatures, they can be used in many thermal relief valve applications.