离心泵过去多装有逆止阀,它的作用是:在停泵时阻止水流倒泄,防止叶轮遭受倒泄水流的水锤冲击,避免水泵叶轮倒转引起事故,避免泵体泄空,便于下次开车启动。但是装了逆止阀,不可避免地要损失一部分水头,以致增大机组负荷,或减少水泵出水量。因此,近些年来,有许多抽水机站进行 Centrifugal pump in the past with more than check valve, its role is to stop the water flow when the pump to stop venting to prevent the impeller suffered water flow hammer blow impact, to avoid pump impeller reversal caused by accident, to avoid the pump leakage, easy to Start by car. However, with check valve, it is inevitable to lose part of the head, which increases the unit load, or reduce the water pump output. Therefore, in recent years, there are many pumping stations