I would like the expert’s advice: can nitrogen be used to purge residual liquid after using a diaphragm pump?
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Our company plans to use diaphragm pumps to transport chemical residues. After use, can nitrogen be injected through the inlet pipe to purge the pump chamber?
It’s so convenient to insert the tube into the water and use it to pump out and replace the water
It is possible to purge from the pump inlet toward the pump outlet. Scan in reverse; it doesn’t work due to the check valve.
It can be blown with nitrogen or pushed with water; use a vent pipe at the pump inlet and another at the outlet. The regulations require sealed discharge, and local discharge is strictly prohibited.
Why is it necessary to blow it clean? Is it because it is used infrequently or because the medium is dirty?
I was involved in a project where an experienced technician made several small grooves in the valve seat of the diaphragm pump, which allowed the fluid to be drained slowly.
See what kind of residue it is. If it is corrosive or may react over time, it’s better to rinse it with water first and then purge it with nitrogen, using a bypass route; in case of a short circuit, the pump should be rinsed separately with water inside it
No, a check valve has a directionality!
At the loading line, purge it and then remove the pipes leading to the tank truck; using water will contaminate the material