Mechanical seal maintenance issues

Preparation before starting

1, comprehensively inspect the mechanical seal, and whether the attachments and pipeline installation are complete and meet the technical requirements.

2, before the start of mechanical seal hydrostatic test, check the mechanical seal for leakage. If there are more leaks, you should find out the reasons and try to eliminate them. If it is still invalid, it should be dismantled and reinstalled. The general static pressure test pressure is 2 ~ 3 kg/cm2.

3, press the pump to rotate the disc, check whether it is light and even. If the bicycle is difficult or not moving, you should check whether the assembly size is wrong and whether the installation is reasonable.

Installation and outage

1, keep the sealed cavity filled with liquid before starting. For conveying a solidified medium, steam is applied to heat the sealed chamber to melt the medium. Before start-up, it is necessary to start the car to prevent the soft ring from cracking due to sudden start-up.

2, for the use of the pump sealing system, the mechanical seal should start sealing system. Stop the oil seal system after parking.

3, After the thermal oil pump is stopped, the cooling water sealed by the sealing cavity and the end face can not be stopped immediately. The cooling water should not be stopped until the oil temperature drops below 80 degrees at the end face seal, so as not to damage the sealing parts.


1, If there is a slight leakage after the pump starts, it should be observed for some time. If continuous operation for 4 hours does not reduce the leakage, pump inspection should be stopped.

2, the operating pressure of the pump should be stable, the pressure fluctuation is not more than 1 kg/cm2.

3, When the pump is in operation, it should avoid the phenomenon of evacuation, so as to avoid dry friction and seal damage of the sealing surface.

3, seals should be checked frequently. During operation, when the leakage exceeds the standard, the heavy oil is no more than 5 drops/minute, and the light oil is no more than 10 drops/minute. If there is still no trend of improvement within 2-3 days, the pump should be stopped to check the sealing device.