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May 11, 2022 View:

Mechanical Seal For Pump Overhaul To Avoid These 6 Major Misunderstandings

The mechanical seal is a key component of various pump machinery and equipment, regular maintenance of the mechanical seal can extend the service life of the pump and improve production efficiency. ace lobe pump reminds everyone, in the mechanical seal routine maintenance, these 6 big misconceptions to pay attention to!

1, the greater the spring compression sealing effect is better. In fact, not, the spring compression is too large, can lead to sharp wear and tear of the friction sub, instant burn; excessive compression makes the spring lose the ability to adjust the dynamic ring end face, resulting in seal failure.

2. The tighter the moving ring seal, the better. In fact, the moving ring seal ring is too tight is not beneficial. First, intensify the wear between the seal and the sleeve, premature leakage; second, increase the dynamic ring axial adjustment, moving resistance, in frequent changes in working conditions can not be adjusted in a timely manner; third, excessive spring fatigue is easy to damage; fourth, the dynamic ring seal deformation, affecting the sealing effect.

3、The tighter the static ring seal, the better. Static ring seal is basically in a static state, relatively tight seal effect will be better, but too tight is also harmful. First, the static ring seal caused by excessive deformation, affecting the sealing effect; Second, the static ring material to graphite, generally more brittle, excessive stress is very easy to cause cracking; Third, installation, disassembly difficulties, easy to damage the static ring.

4. The tighter the impeller locking master, the better. Mechanical seal leakage, the leakage between the sleeve and the shaft (inter-shaft leakage) is more common. In fact, there are more factors that lead to inter-shaft leakage, such as inter-shaft pad failure, offset, impurities in the shaft, shaft and sleeve with a large form error, contact surface damage, the gap between the parts on the shaft, the shaft head thread is too long, etc. can lead to inter-shaft leakage. On the contrary, a moderate locking of the locking mother will always maintain a certain compression elasticity, and the locking mother will automatically lock at the right time during operation, so that the shaft is always in a good sealing condition.

5. New ones are better than old ones. Relatively speaking, the use of new mechanical seals better than the old, but the quality of the new mechanical seal or material selection is not appropriate, with a larger size error will affect the sealing effect; in polymeric and permeable media, static ring, such as no excessive wear, or not to replace the good. Because the static ring in the static ring seat for a long time in a static state, so that the polymer and impurities deposited as one, played a better sealing role.

6, dismantling and repair is better than not dismantling. Once the mechanical seal leakage will be eager to dismantle and repair, in fact, sometimes the seal is not damaged, just adjust the working conditions or proper adjustment of the seal can eliminate leakage. This not only to avoid waste and can verify their ability to determine the fault, to accumulate maintenance experience to improve the quality of maintenance.