Urgently need help with the check valve issue
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A water line has been connected at the inlet of the centrifugal pump; this line is equipped with a flow meter and a check valve, which is mounted horizontally and can function properly. But when the water line ran out of water, the material from the centrifugal pump (which was still running) flowed back into the water line, and the check valve stopped working. Experts, how can this phenomenon be analyzed? Thank you!
Is it possible that the check valve is installed in the wrong direction?
This post was last edited and replied to by Tongxin Zhiyu on 2011-9-16 at 11:08. Reply 1# When the check valve fails, that indeed happens. Additionally, a check valve cannot be used as a shut-off valve; there should also be a gate valve downstream of the check valve, which should be closed when it is not in use
Is it because the system is dirty that the check valve doesn’t close properly?
There must be a problem with the check valve! !
The check valve is stuck, I guess. If the backflow speed is very slow, it is due to the characteristics of a one-way valve; the shut-off valve must be closed
When the pipeline pressure is too low, the check valve may not be able to close and thus ceases to function. It should be noted that a check valve does not require any external force to operate; it relies solely on the pressure in the pipeline to close. If the pressure is too high, it will not be possible to force the valve disc to close. If this phenomenon occurs frequently, it is recommended that you use a check valve with a damping device, as that will be more reliable.
Could it be that there are impurities stuck in the check valve?
There might be a slight negative pressure at the inlet of the centrifugal pump, which prevents your check valve from functioning properly. I guess if it weren’t a negative pressure system, there wouldn’t be a pipe connected at the inlet discharge point for adding water either, right?
Check valves can be installed horizontally or vertically; make sure you install them correctly. Also, it might be stuck.