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The thermostatic actuator located at the one end of the US/S-X (Ultra Surface Sensing) temperature control valve may be installed immersed in the process fluid or mounted non-invasively to the pipeline with the optional band-o-let fitting. This allows the wax actuator to be in contact with the process directly or through thermal conduction to sense the temperature and regulate the inflow of heating media. Input temperatures or steam supply can vary widely, but the control temperature is maintained within desired limits.

The thermal actuator automatically and continuously monitors the temperature and will modulate open and closed to keep the process fluid heated at a specified temperature within a 10°F differential. For example, a 90°F valve would open at 90°F and close at 100°F, keeping the process fluid between 90 – 100°F.of that set temperature.

Typical Applications

These compact self-operating control valves can maintain very tight temperature control of any number of control loops using steam, liquid phase heat transfer media such as Dowtherm®, hot water, hot oil, glycol, etc. In general, they can be used whenever accurate, low cost control is required.

The reverse-acting model, US/S-XR can be used to control cooling media to economically remove heat from equipment or a process.


Design Features

  • Exclusive self-actuating Thermoloid® wax blend thermal actuator
  • All stainless-steel construction
  • Narrow temperature band
  • Compact low mass – fast response
  • Ram-type plug for reliable shut off
  • Unaffected by pressure variations


  • Self-operating – no external power source required
  • Maintains optimal process temperature
  • Prevents process overheating
  • Discharges minimum amount of media for temperature control
  • Quick and easy installation
  • Long service life




654 - 000000 - XXX

1/2” US/S-X-S

654 - 010000 - XXX

1/2” US/S-X-S-BAND2

655 - 000000 - XXX

3/4” US/S-X-S

655 - 010000 - XXX

3/4” US/S-X-S-BAND2


  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, 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 for Direct Acting valves.
  2. Includes Band-O-Let fitting
  3. Buna is standard; Viton, EPDM, and Kalrez are available. 


  • Sizes: ½”, ¾”
  • 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)


US/S-X (Ultra Sense Control Valve) Product Sheet
US/S-X Installation and Maintenance Instructions
Instrument and Process Temperature Control Brochure

Filter Panel

US/S-X Ultra Surface Sensing

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