In sampling systems, sample coolers are commonly used to reduce sample temperatures to the acceptable limits for the expensive and sensitive electronics downstream. Sample cooler temperature control is necessary to protect analyzers from high temperatures in the event of cooling water failure from the primary sample cooler. A thermal shut-off valve is one of the most common methods of stopping the flow to analyzers in such situations.
The HST safety shut-off valve is used as a fail-safe to sense the sample temperature after the sample cooler. In the event of a loss of cooling fluid to the sample cooler, or if the desired sample temperature is exceeded for any reason, the self-operating HST valve will close to prevent damage to analyzers and other equipment.
The reverse-acting US/S-XR or TV/US-XR can be used to control the flow of air or water used to cool the sample. By sensing the sample temperature out of the sample cooler and controlling the cooling fluid flow into the sample cooler, the valve can maintain a constant sample temperature. This could be important if the analyzer or other instrumentation requires that the sample is within a specific temperature range for proper analysis. US/S-XR valves are available in NPT, and TV/US-XR valves have tube fitting connection ends.
100% mechanical, requiring no external source of electricity to operate, these thermostatic valves are the ideal solution to maintain temperature control within your sampling system.