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The TV/SC-A (Tube Valve/Steam Control-Ambient Sensing) valves can be used to turn on steam, air, gas, or liquids compatible with Teflon® and stainless steel in response to ambient temperature changes to protect piping and instrumentation from freeze damage.

The thermostatic actuator located at one end of the TV/SC-A (thermally isolated from the body of the valve), will automatically open or close within a 10°F (5.6°C) differential (e.g. 35°- 45°F) to provide an optimal fluid temperature. The valves are normally closed and will begin to open to inject steam or another fluid when the ambient temperature drops below the valves’ set-point. The valves will close again once the air temperature rises back above the valves’ set-point, saving thousands of dollars in wasted operating costs.

Typical Applications


There are hundreds of applications for these compact, self-contained, automatic steam control valves.

Most often used in steam tracing applications, these self-actuating valves can also be used in the operation of pneumatically operated pumps for injection of antifreeze liquids and instrument enclosure temperature control (See ITCH product sheet).

Design Features

  • Exclusive self-actuating Thermoloid® blend wax thermal actuator
  • Stainless-steel body, fittings, and plugs
  • Compact, low mass – fast response
  • Corrosion-resistant – long service life
  • Ram-type plug for tight reliable shutoff
  • Wide choice of set-points available
  • Large flow coefficient (Cv)


  • Self-operating – no external power source required
  • Economically controls fluid flow
  • Reduces operating and labor costs associated with winterization procedures
  • Eliminates steam waste in tracing
  • Standard tube connections for quick and easy installation
  • Unaffected by pressure variations
  • Quick and easy installation





3/8” TV/SC-A


1/2” TV/SC-A



  1. Full open temperatures “XXX” available: 035°F, 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, but Swagelok are available. The first 0 indicates the fittings.
    1. 0 = Parker fittings
    2. 1 = Swagelok


  • Sizes: 3⁄8”, ½”
  • Maximum Operating Pressure: 200 PSIG (13.8 BAR)
  • Maximum Valve End Temp: 388°F (198°C)
  • Maximum Sensing End Temp: 150°F (66°C) over set-point – limit: 300°F (149°C)


TV/SC-A Product Sheet
TV/SC-A Installation and Maintenance Instructions
Benefits of Thermostatic Steam Control
Instrument and Process Temperature Control Brochure

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TV/SC-A Ambient Temperature Control

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