I bought 2 diaphragm pumps; one can pump vacuum, while the other requires water to be filled in first before it can pump
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What is the difference in principle? Could the expert explain it?
This post was last edited by ylb913 on 2018-8-26 at 14:10. The principle should be the same; the difference lies in capacity. If the check valve is stuck or doesn’t close properly, gas cannot be completely evacuated, which will result in an inability to achieve adequate evacuation. Or a high back pressure can also cause insufficient flow (inability to pump).
If the sealing is not good, wipe it with clean water or clean paper; it’s best to use specialized cleaning paper