Explanation of mechanical seal flushing methods
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I disassembled a double-face mechanical seal, but there was only one LBI; generally, aren’t both faces flushed using methods such as 52, 53A/B/C, 54, 55, etc.? I’m asking an expert for an explanation; new users on Haichuan, please don’t criticize. . Thank you!
Additionally, both the drive side and the non-drive side mechanical seals have a rotation direction; can it be determined from the figure above which side’s mechanical seal it is?
Another port is on the pump cover, entering from the end cover and exiting from the pump cover
Got it, thank you so much. But could you take a look at the rotation direction issue? :handshake
When viewed from the sealed atmospheric side toward the medium side, it rotates clockwise
A flushing hole LBO is machined on the pump cover; the inner gland seals the sealing chamber via radial O-rings, and the isolation fluid circulates through the hole on the inner gland via the LBO port.
Look for it; there must be an LBO hole on the opposite side. The rotation direction is usually clockwise for the drive side and counterclockwise for the non-drive side, as viewed from the drive disc.
Based on the rotation direction shown in the above diagram, it is not possible to determine whether it is a drive-end or non-drive-end mechanical seal. Because the main function of the pump efficiency ring is to transport the isolation fluid from one direction to another. What if the inlet and outlet of the LBI and LBO hole pipelines are reversed? Only by considering the actual direction of pipeline inlet and outlet at the site, as well as the rotation direction of the pump shaft (clockwise when viewed from the motor side), can it be determined which end the mechanical seal should be installed on. I would like to remind the poster that if the sealing mechanisms on the drive side and the non-drive side are reversed, the flow path for the isolation fluid will become ineffective, which can cause the sealing mechanism on one side to overheat due to the inability to remove the isolation fluid, leading to its damage.
Look for the diagonal gland area; it must be there, otherwise how can there be circulation?