29-06-2022, 12:24 PM
Have you tried sucking through the inlet yet?
If you can suck and get no leakage it shows the non return is good, and then porosity or a leak in the diafram are next culprits.
I would have thought porosity bad enough between the suction side and the outlet side in the pump that prevents any vacume being formed would probably be visible with Mk1 eyeball.
Sometimes damage on the diafram is hidden by the metal bits.
Of course it could be the seal between the diafram and the body too.
If you can suck and get no leakage it shows the non return is good, and then porosity or a leak in the diafram are next culprits.
I would have thought porosity bad enough between the suction side and the outlet side in the pump that prevents any vacume being formed would probably be visible with Mk1 eyeball.
Sometimes damage on the diafram is hidden by the metal bits.
Of course it could be the seal between the diafram and the body too.