Reasons why the metering pump does not deliver fluid
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The metering pump for importing 98% concentrated sulfuric acid fails to deliver fluid – (there are no crystals in the pipelines, and the inlet and outlet check valves are in good condition). What could be the possible causes? Thank you. There is a pressure gauge connected to the pump; (I think it’s used to check whether the diaphragm is damaged, but I’m not sure). It shows pressure levels, and these levels change as the plunger moves.
Formal pumps generally don’t use diaphragm pumps, right? Check whether there is sufficient air supply and whether the pump is filled with liquid
In my opinion, in addition to considering the factors of the pump itself, the issues related to the entire system should also be taken into account. For example, whether the system is under pressure enough to meet the operating conditions of the pump, and whether the safety valve in the hydraulic chamber opens. Observe the relationship between the changes in the pressure gauge you see and those of the pump outlet pressure gauge. Compare the vibration of the cylinder block when touched by hand with that during normal operation of the pump. Adjust the pump’s stroke to see if there is any change in the vibration of the cylinder block. I hope this can help you solve the problem.
1. The pressure gauge located on the pump head is used to monitor the condition of the diaphragm; if it shows a reading, it means the diaphragm has ruptured, and this is one of the reasons why no flow occurs. 2. It is necessary to check whether the hydraulic chamber and the gear chamber of this metering pump are connected, that is, whether they share the same lubricant. In this type of pump, if water enters the lubricant, the water will evaporate when heated and end up between the dual diaphragms, which can result in no flow even if the diaphragms are not damaged. 3. Check whether there are any foreign objects in the seat of the inlet and outlet check valves; the inability of the valve ball to return to its seat is also a reason why flow cannot be achieved
It was amazing! Very practical! :victory:
There might be air on the hydraulic side of the diaphragm. Open the safety valve and try refilling it with some oil.
What type of metering pump is that? Diaphragm or mechanical?
It’s likely that the diaphragm has ruptured, resulting in a lack of flow; there are leaks in the inlet and outlet valves as well as in the safety valve, and the viscosity of the medium is too high
Personally, I think it’s a problem with the pipes. Our factory also used to have a metering pump that wouldn’t deliver any fluid no matter what; the pressure readings were normal. The solution was to flush the pipes and clean the filter at the inlet.
When handling 98% concentrated sulfuric acid, what type of metering pump is used? From that manufacturer?