DXF系列四氟单向阀采用聚四氟乙烯设计，聚四氟乙烯与金属面密封，独特的结构设计,使该产品寿命提高2倍，主要适用于家用及商用空调。 DXF series teflon check valve adopts polytetrafluoroethylene design,Teflon and metalsurface seal,unique structural design,so that the product life increased by 2 times,mainly for domestic and commercial air conditioning.