1. 4-way reversing valve 2. CE, UL certificates 3. best price with good quality 4. much export experience 1. Name:4-Way Reversing Valve2. Functions: 4-Way Reversing Valve is an important component in heat pump air conditioners. It is applicable in central, commercial and split type and window type air conditioners. It is used for the reversing operation of refrigerant flowing with aim of cooling ...