Duty pump and spare pump

When the CB20·10/30·60 middle/low pressure vehicle-use fire pump works under low-pressure operating condition,the middle-pressure room′s temperature will be high.

60型中低压车用消防泵在低压工况运转时,中压室发热现象,提出在中压室增加循环冷却水的解决方案:在角阀体上开一小孔,使得在角阀关闭状态下低压室的水能进入中压室进行冷却,增加回水管路,中压室的水能够回到水泵吸入口。