What do I need to check before doing a mechanical seal?

The dynamic and static rings of the mechanical seal are the top priority of inspection. When observing, pay attention to whether there are scratches and cracks on the surface of the dynamic and static rings. If there are defects on the dynamic and static rings of the mechanical seal, it will inevitably be There is a leak problem. When checking the dynamic and static rings, use professional tools to check whether the sealing surface is flat. If necessary, you can also perform a hydraulic test on the mechanical seal. If the sealing surface of the dynamic and static rings of the seal enters the pressure water, the dynamic and static rings will be separated and the seal will fail.u200b

1. Check whether there is any error in the model and specification of the mechanical seal to be installed.u200b

2. Check whether the dimensional accuracy, geometric accuracy and mutual relationship between the host and the installation of the mechanical seal meet the technical requirements. There are mainly the following aspects:

(1) It is necessary to check the radial runout tolerance of the shaft (or shaft sleeve) where the mechanical seal is installed, the surface finish of the shaft and the dimensional tolerance of the outer diameter.u200b

(2) Tolerance of the verticality between the sealing cavity and the gland combined with the positioning end facing the center line of the shaft (or bushing).u200b

(3) The end of the shaft (or shaft sleeve) where the moving ring seal is installed, and the chamfering and smoothness of the end structure of the housing hole where the mechanical seal is installed.u200b

(4) The axial displacement of the rotating shaft of the mechanical seal when it is working.u200b

3. During the installation process, it should be kept clean, and it is not allowed to hit the sealing element with tools to prevent damage and damage.u200bu200b

4. During installation, the surfaces of the dynamic and static rings should be coated with a layer of clean engine oil and turbine oil. The auxiliary sealing ring (including the dynamic ring sealing ring and the static ring sealing ring) should also be coated with a layer of clean engine oil or turbine oil before installation to ensure smooth installation.u200b

5. Put the static ring sealing ring on the back of the static ring and put it into the sealing end cover. Be careful not to damage the end face of the static ring. Make sure that the end face of the static ring is perpendicular to the center line of the end cover, and pay attention to the back of the static ring. The anti-rotation grooves should be aligned with the anti-rotation pins, but not in contact with each other. 6. The rotating part is fixed with the shaft by the two fixing screws on the spring seat. When tightening the fixing screws, the service length of the spring should be guaranteed.