Grundfos mechanical seal

Precautions when installing Grundfos mechanical seal Grundfos mechanical seal: a. Pay great attention to avoid installation deviation during installation (1) The tightening gland should be carried out after the coupling is aligned, and the bolts should be evenly supported. , To prevent the deflection of the end face of the gland, check each point with a feeler gauge, and the error is not more than 0.05 mm. (2) Check the fitting gap (ie concentricity) between the gland and the outer diameter of the shaft or sleeve, and the surrounding should be uniform. Use a plug The allowable error of each point of the ruler check is not more than 0.01 mm. b. The spring compression should be carried out according to the regulations, and it is not allowed to be too large or too small. The error is required to be 2.00 mm. If it is too large, it will increase the specific pressure of the end face and accelerate the wear of the end face. The specific pressure is insufficient and cannot play a sealing role. c. After the moving ring is installed, the moving ring should be able to automatically spring back after being pressed against the spring. Requirements for the sealing ring: the sealing ring is the general term for the moving ring and the static ring (the same below) ), is the most important component of the mechanical seal. The seal ring determines the performance and life of the mechanical seal to a large extent. Therefore, some requirements are put forward for it. It has sufficient strength and rigidity: under working conditions (such as Pressure, temperature, sliding speed, etc.) are not damaged, the deformation should be as small as possible, and the sealing performance can be maintained when the working conditions fluctuate. In particular, the sealing end face must have sufficient strength and a certain corrosion resistance to ensure that the product is used satisfactorily Life. Good thermal shock resistance: The material is required to have a higher thermal conductivity and a smaller linear expansion coefficient, so that it will not crack when subjected to thermal shock. Smaller friction coefficient: The seal ring should have a smaller friction coefficient. Good self-lubrication: If a short period of dry friction occurs during work, the sealing end face will not be damaged. Therefore, the sealing ring must have good self-lubrication, and the sealing ring material and sealing fluid must have good wettability.