What are the reasons why a diaphragm compressor doesn’t deliver flow?
Thread Content
Is there anyone familiar with diaphragm compressors? We are using a small diaphragm compressor; the diaphragm is fine, and the check valves at the inlet and outlet are also okay. We don’t know why it just won’t start working
Could there be any issues with the oil quantity or quality?
It might be that the oil pressure isn’t high enough; the diaphragm needs to be pushed by oil pressure
If the oil pressure check shows no issues, then it must be a problem with the diaphragm. It is necessary to check whether there are any cracks or deformations in the diaphragm; deformation of the diaphragm can significantly affect work efficiency.
Check whether the sealing points are leaking air
First: Check the diaphragm for any cracks or damage； Second: Check whether the lubricating oil inside the diaphragm is dirty and whether there is enough oil (air needs to be released when adding oil); only with sufficient oil volume can the oil pressure be maintained.
If there are no issues with the oil pressure, the diaphragm, or the intake and exhaust valves, check the test port of the pressure regulating valve to see if it cannot be fully closed.
It’s probably a problem with the oil, as well as the sealing performance of the membrane (on the oil side).
The diaphragm pumps in our unit are imported pumps. The medium is high-temperature molten urea liquid, with a pressure of 9 Mpa and a temperature of 180°C. The structure consists of a crosshead, connecting rod, connecting push rod, and dual diaphragms. There are hydraulic dual-function valves and hydraulic air fill valves. The oil quality is poor and the oil level is low, resulting in insufficient oil supply to the hydraulic double-function valve and the hydraulic breather valve, as well as inadequate oil replenishment. The connecting rod is not in the correct position, and the diaphragm has a limited stroke, which leads to insufficient pumping capacity.