Plunger pump suction
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I have a question for everyone: when a plunger pump draws in liquid, must there be positive pressure in the container? Can’t it be under negative pressure? Otherwise, won’t it be possible to draw in air?
Maintain at atmospheric pressure or positive pressure. Won’t negative pressure flatten the container? It’s a problem not only if the container can’t handle it, but also if the material vaporizes, resulting in insufficient pumping capacity or even no flow at all.
The suction and discharge in a plunger pump are achieved through the effect of volume changes on the pressure in the working chamber; from this perspective, it is possible to draw liquid even under negative pressure
Negative pressure is acceptable within a certain range; beyond that it’s not feasible, as it will result in no measurement being taken.