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The working condition of check valve of feed water pump
The author: Time:2021/3/24

给水泵逆止阀的工作情况如下:
  当给水泵启动,在出口截门开启,给水达到一定流量后,阀芯在给水的作用下升起一定的高度,给水即流出,同时由于逆止阀阀芯的上升,带动杠杆转动,使再循环阀的刀片式活门向下移动,关闭阀口。当给水流量减少时,逆止阀阀芯下落。杠杆的左端与阀芯相联的部分也下降,这样就使右端活门上升,开启再循环门维持水泵较小的允许流量。当停泵时,阀芯自动下落,关闭阀口通道,防止高压给水倒流。
  这种给水泵逆止阀在运行中经常发生再循环门刀片式活门损坏、自动再循环阀开关失灵,因而常有一部分给水经再循环门流走,影响了锅炉给水的正常供给。

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