Installations with suction lift require a good quality foot valve to avoid loss of prime - remove in-built check valve.

进水口的安装需要使用一个品质优良的底阀，以避免进水口压力损失-拆除内置式止回阀。

youdao

Installations with suction lift require a good quality foot valve to avoid loss of prime - remove in-built check valve.

进水口的安装需要使用一个品质优良的底阀，以避免进水口压力损失-拆除内置式止回阀。

youdao