I would like to learn what type of positive displacement (PD) pumps are used to remove liquids from vacuum applications. I have been searching for an example application, but it seems to be a rare case.
So, imagine you have a liquid trap in a large vacuum system. The flow of water accumulation is so high that it warrants an extraction pump to remove the water. The pressure is about 90% vacuum. The goal is to remove the water to dump so it only need be pumped back up to ambient.
Is there a type of PD pump that is better at this application? From what I have found, very few pump manufacterers publish performance for vacuum operation.
Does anybody have an example of a vacuum application where a PD pump is used to extract liquid?