High Sample Temperature Valve

Protect pumps, sensors and analysers when sample temperature moves outside the expected operating range

High sample temperature (HST) valves provide automatic, mechanical shut-off protection for sample lines feeding sensors, analysers and instruments. Installed after the sample cooler, the normally open valve allows flow while the sample remains below the selected set-point and closes if the temperature is exceeded, helping protect downstream equipment from unsuitable sample conditions.

Protects sensitive measurement equipment from unsuitable sample conditions

Sensors, analysers and instruments are often designed to work within defined sample conditions. If the sample temperature rises beyond the expected operating range, the HST valve closes automatically to help protect downstream equipment from damage.

Adds a simple safeguard after the sample cooler

The HST valve is installed between the sample cooler outlet and the analyser or instrument inlet. If cooling performance is reduced, cooling water is lost or the sample temperature is higher than intended, the valve provides an automatic shut-off point before the sample reaches sensitive equipment.

Operates mechanically without power or signal

The valve is self-operating and responds directly to fluid temperature, so it does not require electrical power, air supply or a control signal. This makes it a straightforward protection device for sample lines and monitoring systems.

Automatically resets when conditions return to normal

When the sample cools below the set-point, the valve automatically reopens and allows flow to resume. This helps manage temporary temperature excursions without relying on manual intervention.

Supports reliable sensor and analyser performance

By helping prevent unsuitable sample temperatures reaching downstream equipment, the HST valve supports more reliable monitoring, analysis and control in water treatment, process and chemical dosing applications.

Downloads

Datasheet
Manual
Brochure

Key information

MAX PRESSUREMAX TEMP
3000 PSIG / 207 BAR
149°C

Key features

  • Automatic temperature-based shut-off
  • Installed after the sample cooler
  • Protects sensors, analysers and instruments
  • Self-operating mechanical valve
  • No external power or signal required
  • Normally open below the valve set-point
  • Closes when the set temperature is exceeded
  • Automatically resets when the sample cools
  • Stainless steel construction
  • Ram-type plug for tight shutoff
  • Multiple set-points available
  • ½” NPT connection

Typical applications

  • Sample lines feeding sensors and analysers
  • Sample cooler outlet protection
  • Boiler water sampling systems
  • Steam and water analysis systems
  • Conductivity measurement systems
  • pH and ORP monitoring systems
  • Chlorine analyser sample lines
  • Cooling water monitoring
  • Process water monitoring
  • Chemical dosing control feedback loops
  • Sampling panels and analyser packages
  • OEM sample conditioning systems

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