1. If the pump is not filled with fluid before start up, then the air would be delivered, resulted in too low pressure differential or vacuum at the pump entry, so the liquid could not be sucted into the pump.
2 When increasing the opening of flow control valve, the reading on pressure indicator will drop, while on vacuum indicator, increases.
3. The pump selection should be based on the fluid delivered. The performance needed, suction and discharge conditions, continuous or intermittent running, etc should be taen into consideration. And also, the shaft horsepower of the pump should be calculated.
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