A very strange problem regarding self-priming pumps
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The company uses a 100CYZ-40 self-priming pump as the material pump for one of its storage tanks. Recently, a very strange phenomenon has been occurring: every morning, when this pump is used to discharge the first batch of material, there’s always gas trapped in the pump chamber. Each time, it’s necessary to vent that gas before the material can be discharged normally. After that, the pump operates fine throughout the rest of the day. But after one night (we do not ship on nights), gas will build up in the pump chamber again the next morning, and it will need to be vented. This pump is new, and there are no leaks whatsoever; the shipment contained toluene. Excuse me, everyone. What’s going on here, and how can it be resolved? ? ?
The check valve built into the pump inlet does not seal properly! When dealing with toluene, how do I choose this shaft-sealed self-priming pump? A bit dangerous
I also don’t understand this. One of the inherent characteristics of self-priming pumps is that they don’t require priming. Firstly, there’s a foot valve at the inlet (the so-called check valve). Secondly, the outlet is positioned much higher than the inlet. Therefore, my analysis is as follows: it’s possible, as mentioned by the second poster, that the foot valve has malfunctioned. I really can’t think of any other reasons. Could it be that the pump has run out of fluid?
Even if time is found, there’s no need to pay attention a second time, unless the evaporation is extremely high
Agree with the second floor! Because toluene is highly volatile!
There are still gaps. Check carefully; the new pump is the same.
1. It is said to be the gas evaporated from toluene; then why do other pumps of the same model that handle toluene not exhibit this phenomenon? II. If it is confirmed that the pump has no leaks, is it possible that there is a leak in the feed pipe, causing air to be drawn into the pump chamber after the pump is started? III. Pumps of this type have a built-in exhaust function; even if there is some gas in the pump chamber, they should still be able to deliver liquid. Is it possible that the pump has a defect and has lost its self-exhaust function?
You can give it a careful check; perhaps there’s a problem with the seal, or the device itself has some leaks.