It’s always the TXV (Thermal Expansion Valve) haha. The Danfoss TUA stainless steel txv is very unique as it doesn’t need to be wrapped to braze. Stainless steel conducts heat 11 times slower than copper. Although, underneath the stainless steel is copper which allows for a copper to copper connection. So, 15% silphos can be used to braze in this style of thermal expansion valve.
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