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The reverse-acting TV/SC-IR (Tube Valve/Instrument Enclosure) temperature control valve opens on rising temperature to regulate the flow of cooling media to an enclosure. The thermal wax actuator end of the valve is installed into the wall of the instrument enclosure to continuously senses the ambient temperature within the enclosure.

When the temperature rises above the valve’s set-point it will automatically modulate open to allow the injection of the cooling media. The valve will modulate closed again once the ambient temperature is within 10°F (5.6°C) of the open set-point (Example: a 75°F valve would open at 75°F to allow the insertion of the cooling media and close at 65°F, keeping the enclosure interior between 75 – 65°F).


Typical Applications


The TV/SC-IR can be used to keep an enclosure cool via a vortex cooler to protect expensive analyzers and instrumentation from overheating. For example, a 90°F valve would open at 90°F to allow the compressed air into the vortex cooler valve, which then spins the air at high velocity creating a hot and cold fraction of air. As cold air fills the enclosure, the hot air will be expelled outside, maintaining a desired temperature with the enclosure.

For heating applications, the TV/SC-I direct-acting valve opens on falling temperatures to regulate the flow of steam into the enclosure to maintain a desired temperature within the enclosure and to protect instrumentation from freeze damage.


Design Features

  • Exclusive self-actuating Thermoloid® blend wax thermal actuator
  • Stainless Steel body, fittings, spring & plug
  • Compact low mass – fast response
  • Corrosion resistant – long service life
  • Ram-type plug for reliable tight shut-off
  • Compatible with standard tubing and connections


  • Self-operating – no external power source required
  • Maintains enclosure temperature within a specified range
  • Eliminates danger of overheating and explosion hazard
  • Unaffected by pressure variations
  • Quick and easy installation




743 - 0X1000 - XXX

3/8” TV/SC-IR-S-SS

744 - 0X1000 - XXX

1/2” TV/SC-IR-S-SS


  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 opening temperature for Reverse Acting valves
  2. Standard fittings are Parker A-LOK, but Swagelok are available. The first 0 indicates the fittings.
    1. 0 = Parker fittings
    2. 1 = Swagelok


  • Sizes: ⅜”, ½”
  • Maximum Operating Pressure: 200 PSIG (13.8 BAR)
  • Maximum Valve End Temperature: 388°F (198°C)
  • Maximum Sensing End Temperature: 150°F (66°C) over set-point – limit 300°F (149°C)


TV/SC-IR Product Sheet
TV/SC-IR Installation and Maintenance Instructions
Instrument and Process Temperature Control Brochure

Filter Panel

TV/SC-IR (Tube Valve/Instrument Enclosure Reverse Acting)

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