Could the mechanical seal flushing line cause the flushing fluid to flow back?
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Dear experts, there is a UW pipeline in the company that supplies water for tasks such as cleaning mops in the workshops. A branch of this pipeline leads to an axial flow pump used for flushing the machine seals, and the PLAN32 flushing method is employed. There have been instances of contamination in the water used in the workshops; could it be that a failure in the check valve in the pipeline used for flushing the machine seals has caused backflow into the UW pipeline, resulting in contamination? I seek your guidance.
Check valves are generally installed on the Plan32 flushing pipeline, so theoretically, backflow of the medium will not occur.
The pressure in PLAN32 must be higher than that in the sealing chamber, and there is also a check valve on the pipeline
There are two units, AB. Through the sight glass, it can be seen that in one unit the water flow is clear, while in the other the water is turbid and no sign of flow can be detected. If the check valve fails, there is a possibility of backflow of the medium
What is the pressure at 32? What is the pressure at the pump seal chamber?
In scheme 32, when the flushing pressure is higher than the pressure in the sealed chamber, it should not cause backflow of the medium; there must be a problem with the flushing pipeline itself