Answer: All components of mechanical seals and their related assembly contact surfaces must be cleaned with acetone or anhydrous alcohol before installation. They should be kept clean during installation, especially the dynamic and static rings and auxiliary sealing components should be free of impurities and dust. Apply a layer of clean engine oil or turbine oil on the surface of the dynamic and static rings.
Tightening the gland should be done after the coupling is aligned. The bolts should be tightened evenly to prevent the gland section from being skewed. Use a feeler gauge or special tool to check each point, and the error should not exceed 0.05mm.
Check the matching clearance (and concentricity) between the gland and the outer diameter of the shaft or sleeve. It must be ensured to be uniform all around. Use a feeler gauge to check each point. The tolerance is not greater than 0.10mm.
The spring compression should be carried out according to regulations. It is not allowed to be too large or too small. The error is required to be ±2.00mm. Too large will increase the cross-sectional pressure ratio and accelerate the cross-sectional wear. Too small will cause insufficient pressure ratio and fail to play a sealing role. After the spring is installed, it should move flexibly in the spring seat. When using a single spring, pay attention to the direction of rotation of the spring, which should be opposite to the direction of rotation of the shaft.
The dynamic ring must be kept flexible after installation, and it should be able to bounce back automatically after pressing the dynamic ring against the spring.
First, put the static ring seal ring on the back of the static ring, and then install it into the sealing end cover. Pay attention to protecting the static ring section, ensuring the verticality of the static ring section and the center line of the end cover, and align the anti-rotation groove on the back of the static ring with the anti-rotation pin, but do not let them contact each other.
During the installation process, it is never allowed to knock the sealing element directly with a tool. When knocking, special tools must be used to knock to prevent damage to the sealing element.
During assembly, all sealing rings should be coated with lubricants such as soapy water to avoid damage to the rubber ring during assembly. Grease is applied between the sealing surfaces of the dynamic and static rings to prevent the dynamic and static ring sealing surfaces from being worn before use.
When assembling the floating ring, be careful not to knock down the floating ring spring to avoid affecting the floating performance of the floating ring after the spring is knocked down. After the floating ring is assembled, you can gently press the floating ring to determine whether it has good floating performance.
When installing the seal, handle it with care to prevent damage to the seal. Clean the seal and cavity during installation. When tightening the mechanical seal gland, the tightening bolts should be evenly stressed to prevent uneven stress from damaging the mechanical seal. For quick-install mechanical seals, after the overall assembly is completed, do not forget to move the positioning piece radially away from the shaft and fix it.
