保值增值防止流失
Preserve and increase value and prevent losses
倒流防止设备
backflow-prevention device
防止反极性
reverse polarity protection
防止反射裂缝
to prevent reflective cracking
防止流失举措
Counter measures for Prevent loss
高能耗管道倒流防止器
backflow preventer with high-energy consumption
减压式倒流防止器
reduced-pressure principle backflow prevention assembly
节能型倒流防止装置
Energy-saving Anti-backflow Apparatus