防冻系统 meaning in English

defrosting system
winterization system

Tai thermal anti - icing system
加热防冻系统
When the system finishes water supply , this valve can automatically supplement air into the sealed water pipe , which can be evacuated just to open the valve at the outlet , suitable for the evacuation and freeze - proof system of water supply etc . facilities
自动充气排空管系统供水完成后，该阀可自动补充空气进入密封水管，将下水端阀门打开即可实现水管的排空，适用于供水等设备的排防冻系统