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Utilizing a thermostatic wax actuator, the TV/HAT (Tube Valve/Heat Actuated Trap) responds only to fluid temperature to control a system. After condensate forms and cools to the valve’s set point, the valve modulates the flow to maintain a constant condensate discharge temperature. During start-up, the TV/HAT is wide open for rapid venting and initial heat-up and then will adjust based on fluid temperature. After shutdown, the valve is self-draining to eliminate freeze damage.

For heating of temperature-sensitive instruments or process fluids, the reduced temperature available for tracing simplifies operations and eliminates overheating problems. For other heat transfer fluids, the TV/HAT valve maintains a constant discharge temperature, thus providing the benefits of accurate process temperature control and improved efficiency.


Typical Applications

TV/HAT valves are ideal for use in conjunction with tracer tubing and tracing systems using pre-traced tubing bundles. These valves are optimal for replacing conventional steam traps on winterization tracing, instrument tracing, condensate return system freeze protection, tracing for processes under 150°F (65°C), and other applications requiring in-line flow control based on temperature.


Design Features

  • Exclusive self-actuating Thermoloid® blend wax thermal actuator
  • Stainless steel body, fittings, spring, and plug
  • Corrosion-resistant – long service life
  • Compact, low mass for fast response
  • Ram-type plug for tight reliable shutoff
  • Operates in narrow temperature band
  • Standard fittings are Parker A-LOK, but Swagelok are also available


  • Self-operating – no external power source required
  • Eliminates live steam losses
  • Downstream actuator for greater sensitivity
  • Unaffected by pressure variations
  • Wide choice of set points
  • Operates in any position
  • Easy to install



  1. Full open temperatures “XXX” available: 040°F, 050°F, 055°F, 060°F, 065°F, 075°F, 085°F, 090°F, 095°F, 100°F, 105°F, 110°F, 120°F, 125°F, 130°F, 140°F, 150°F, 155°F, 160°F, 170°F, 180°F, 190°F and 200°F
    1. Closing temperature is typically 10°F above opening temperature.
  2. Standard fittings are Parker A-LOK. Swagelok fittings available upon request.
  3. Replace singular “X” with 0 for EPDM body seals; 1 for Viton body seals. Other seals available.
  4. Seal material compatibility:
    1. EPDM – air, water, steam, ketones, and synthetic hydraulic oils
    2. Viton – air, fuel, oil, gas, petroleum-based hydraulic oils
  5. Flow direction is reversed on valves that close over 210°F (98.9°C)


  • Sizes: 1⁄4”, 3⁄8”, 1⁄2”
  • Maximum Operating Pressure: 300 PSIG (20.7 BAR)
  • Maximum Temperature: 150°F (66°C) over set-point limit 300°F (149°C)


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

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TV/HAT (Tube Valve/Heat Actuated Trap) In-Line Temperature Control

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