Is it harmful for a slurry pump to run in reverse after it has been stopped?
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Slurry pump, pump stopped; water is present in the pump pipeline, and this water flows back, causing the pump to rotate in reverse. Is this harmful? What are the solutions?
It shouldn’t; it’s a rolling bearing, and there’s no issue with the direction of rotation for the mechanical seal either. For reference. However, the cause of the reversal is likely a problem with the check valve; it should be disassembled and inspected.
Senior Shiraishi, take a close look at the picture – does this one have a check valve? Based on personal experience, it is recommended not to allow the pump to run in reverse; this issue can be avoided by closing the outlet valve first before shutting down the pump.
In my opinion, it is better not to reverse the pump. I am not aware of the type of seals and bearings used in this pump; if the seals are mechanical seals with large springs of type 108 or 109, reversing the pump will cause the springs to rotate in the opposite direction, which will inevitably damage the mechanical seals. Additionally, if no mechanical seals are used and graphite bearings are employed, reversing the pump will result in the spiral grooves of those bearings rotating in the opposite direction, which could also lead to wear on the graphite bearings. There is a valve at the outlet; if there is no internal leakage, it’s sufficient to close the outlet valve before shutting down the pump
How is the impeller fixed? If it’s fixed with threads, reversing rotation can easily cause the impeller to come off
The impeller tends to loosen, resulting in damage to the bearing housing
Too kind of you; I’m just an old man with nothing to do. As the title suggests, this really should be equipped with a check valve. It’s undeniable that even when a check valve is installed, it’s still necessary to close the outlet valve first before shutting down the pump. As for damage to the impeller caused by the loosening or falling off of the bolts that secure it, this is a very likely possibility. I ignored this factor; I’m sorry.
There is definitely a risk; install a check valve, or close the valve after shutting down the pump!
Your reply doesn’t match your usual style of taking issues seriously, haha:lol
Passerby, learned it*. Up to the 4th floor, 5th floor