backflowing

常见例句

Four required per backflow preventer.
每个防回流阀需要四个。
Winterization of backflow preventers.
防回流阀的过冬处理。
For use with backflow preventer test cocks to protect from damage.
用于防回流阀测试旋塞，防止受到破坏。
A check valve may be required ahead of the backflow preventer.
此时在防回流阀前面可能需要安装一个止回阀。
This would create an air gap to eliminate any possible backflow.
这将产生一个气隙以消除任何可能的回流。
The backflow preventer must be installed upstream of the regulator.
防倒流装置必须安装在调节阀的上游位置。