I have questions relating to a diaphragm vacuum pump. I am looking for a diaphragm vacuum pump that can pull down a tank to between 50 and 100 Torr and at the same time push the outlet to another tank sitting at 15 psig. I see some pumps that have ratings for both max vacuum inlet and max pressure output but it’s not clear to me that the individual ratings apply to doing both at the same time. Intuitively it seems to me that for a given diaphragm vacuum pump, its ultimate vacuum capability would change (lessen) as the output has to go up above atmospheric. I have been told the output pressure doesn’t make a difference to the input capability –but I haven’t accepted this answer yet. Does anyone else know the answer to this, and if what I heard it true, can you explain it? Thanks.
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