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The TV/HAT-RA (reverse acting, heat actuated trap valve with tube fittings) should be installed as close to the pump casing as possible to automatically and continuously control the cooling media within the system to maintain the desired temperature. Since it is what we classify as reverse-acting, the valve will open when the fluid temperature rises to the valve’s set point.

As the fluid temperature increases to within the operating range of the TV/HAT-RA, the thermal actuator modulates the valve open. If the fluid temperature is above the valve’s set point, the temperature control 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 outlet fluid temperature.


Typical Applications

The TV/HAT-RA 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 to maintain a constant temperature. Since the TV/HAT-RA valve opens on rising temperatures, it can be used in many thermal relief valve applications such as liquid cooling systems, water-cooled heat exchangers, injection mold cooling, die-cast mold cooling, and water-cooled compressors.

Design Features

  • Exclusive self-actuating Thermoloid® blend paraffin wax actuator
  • Compact, low mass, responsive
  • Corrosion-resistant – Long service life
  • Operates in narrow temperature band
  • Stainless steel body, fittings, spring, and plug
  • Ram-type plug for tight reliable shutoff


  • Self-operating – no external power source required
  • Fully wetted temperature control actuator assures sensitivity to fluid temperature
  • Unaffected by pressure variations
  • Wide choice of set points
  • Operates in any position
  • Easy installation




223 - 100X00 - XXX

3/8” TV/HAT-RA-SS2

223 - 110X00 - XXX


224 - 100X00 - XXX

1/2” TV/HAT-RA-SS2

224 - 110X00 - XXX



  1. Full open temperatures “XXX” available: 040°F, 045°F, 050°F, 060°F, 070°F, 075°F, 085°F, 095°F, 100°F, 105°F, 110°F, 115°F, 120°F, 125°F, 130°F, 140°F, 150°F, 160°F, 170°F, 175°F, 180°F, 190°F, 200°F, and 210°F
    1. Closing temperature is typically 10°F below the opening temperature
  2. Standard fittings are Parker A-LOK
  3. Swagelok fittings replace standard Parker fittings
  4. Replace singular “X” with 0 for EPDM body seals; 1 for Viton body seals
  5. Seal material compatibility:
    1. EPDM – air, water, steam, ketones, and synthetic hydraulic oils
    2. Viton – air, fuel, oil, gas, petroleum-based hydraulic oils


  • Sizes: 3⁄8”, 1⁄2”
  • Maximum Operating Pressure: 150 PSIG (10 BAR)
  • Maximum Temperature: 150°F (66°C) over set-point – limit 300°F (149°C)


TV/HAT-RA Product Sheet
TV/HAT-RA Installation and Maintenance Instructions
Instrument and Process Temperature Control Brochure

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TV/HAT-RA reverse acting, heat actuated trap valve with tube fittings

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