If you want to learn more on how refrigerants work, you can read or watch our tutorial here. Just remember that refrigerants have a much lower boiling point than water.

The boiling is essential as the refrigerant will absorb the heat from the ambient air and carry this away to the compressor. However, if we went higher up into the atmosphere, say to the top of mount Everest, then we would find that water boils at only 70°c (158☏) and that’s because we’re higher up so there is less atmosphere above us to push down on the water, making it easier to boil. For example, we’re used to water boiling at around 100°c (212☏) that’s because most of us live near sea level so the air around us is compressed by all the weight of the atmosphere above us. The valve decreases the pressure to allow the refrigerant to boil at lower temperatures.

Water boiling at different temperatures due to changing pressure It doesn’t matter which type of expansion device is used, they can all be found in the same location which is just before the evaporator. Small refrigeration units such as house hold refrigerators typically wouldn’t use a valve and would instead use a fixed orifice capillary. The TXV is used in many refrigeration systems, everything from simple split units to chillers. Where to find the thermostatic expansion valve? The correct name for this type of valve is the thermostatic expansion valve, however, this is often abbreviated to thermal expansion valve and has the acronym of TXV or sometimes TEV.

If you’re in the HVAC industry and are in need of high quality thermostatic expansion valves for your refrigeration system, then I recommend checking out what Danfoss has to offer. Their line of products are universal and adaptable, delivering exceptional quality and reliability, as well as a wide capacity and refrigerant range. You can find out more about Danfoss Thermostatic Expansion Valves by visiting Naming convention. You can watch the video tutorial on this article by scrolling to the bottom of the page. The expansion valve is an essential component in almost every refrigeration cycle and the thermostatic expansion valve is the most commonly used within HVAC systems. In this article we’ll be learning how thermostatic expansion valves work.

Thermostat working principle pdf