... ,1/2,3/4,7/83. Operation Principle Raw material of Square service valve: Copper Alloy. The ... the inner pipe assembly of air conditioner outdoor. Valve nozzle, the refrigerant place, is with the ... products, but also decrease the cost. (3) Valve body adopts the structure of upper circle and ... down square. Valve nozzle and valve body is punched together. The structure is ...