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https://www.abcclim.net/detendeur.html Description of the operation of the thermostatic expansion valve with internal equalization, this essential element of the refrigeration circuit is sometimes misunderstood, this video aims to give some clues to better understand its operation. Like all expansion organs, it allows the evaporator of a refrigeration installation to be supplied optimally. It regulates the superheat so that the evaporator is used over its entire surface while protecting the compressor.