A field issue regarding diaphragm pumps
Thread Content
The unit is equipped with a wastewater metering diaphragm pump used for draining liquid from the water tank; it is connected to the pressure system of the tower, with a pressure of around 4 kilograms. The height of the water tank is approximately 15 meters, and the pump is located on the ground. Now, as soon as the inlet and outlet valves are opened, the liquid level in the water tank drops (even before the pump starts). This pump has two (one normal and one as a backup). In both cases, it seems unlikely that there is a problem with the pump’s intake and exhaust valves. Could it be that the system pressure forced the liquid through? Is such a possibility existing from a structural perspective? Is there any other reason?
I’m asking experienced colleagues for help to take a look; thank you
I guess so; otherwise where would the liquid go?
From a structural principle perspective, liquid pressure can indeed force the liquid to pass through, unless the spring force of the suction and discharge valve is strong enough.
Are there any other possibilities? Or is there something wrong? Or is there any solution? For now, all I can think of is adding a control valve at the outlet
There should be check valves at both the inlet and outlet of the diaphragm pump; otherwise, how can pressure be applied? There should also be a check valve on the pump’s outlet pipeline. Consider whether there might be internal leakage in the pump’s outlet safety valve It would be best to have photos from the scene
Is the medium dirty? If it’s dirty, it might be because the check valve at the inlet of the pneumatic diaphragm pump is stuck or the seal isn’t tight, resulting in leakage. If it’s not dirty, there may be a problem with the pump inlet check valve. In short, it’s all related to the check valve at the pump inlet.
Disassemble the pump for inspection to see if it’s a problem with the check valve
The pressure in the water pack wasn’t specified; was it the pressure difference that pushed it through?
What is the tank pressure corresponding to the pump outlet? If it is lower than the pressure in the inlet dehydration vessel. A pressure difference will then be created; when this difference is sufficient, the liquid will be forced to flow through.