Requirements for the installation and use of mechanical seals

Thread Content

Mechanical seal – Requirements for the installation and use of mechanical seals: 1) It is necessary to select an appropriate model of mechanical seal and match it with the suitable materials based on the operating conditions and characteristics of the main machine, in order to ensure proper operation and a long service life for the mechanical seal. 2) The radial runout tolerance of the shaft (shaft sleeve) at the location where the mechanical seal is installed should be ≤0.04 mm, and the axial displacement of the rotor should be ≤0.1 mm. 3) Install the sealing end cover (or housing) for the stationary ring of the mechanical seal, ensuring that the perpendicularity of the alignment surface to the shaft is ≤0.04 mm. 4) When installing a mechanical seal, it is necessary to clean the shaft (shaft sleeve), seal chamber, seal end cover, and the mechanical seal itself thoroughly to prevent any impurities from entering the sealing area. 5) When the temperature of the medium being transported is too high, too low, or when it contains impurity particles, as well as flammable, explosive, or toxic substances, it is necessary to follow the relevant standards for mechanical seals and take appropriate measures such as sealing, flushing, cooling, and filtering. 6) Appropriate lubrication should be provided when installing the mechanical seal. Follow the product installation instructions to ensure the correct installation dimensions for the mechanical seal. 7) The equipment must be filled with the medium before operation to prevent seal failure due to dry friction. 8) For mechanical seals with single-spring drive in the sample, the winding direction of the spring should be selected appropriately; generally, when viewed from the stationary ring side and the shaft rotates clockwise, a right-handed spring should be used. Otherwise, choose the left spring. Key technical points for the installation and use of mechanical seals: 1. The radial runout of the equipment’s rotating shaft should be ≤0.04 millimeters, and the axial displacement must not exceed 0.1 millimeters ； 2. The sealing parts of the equipment must be kept clean during installation; the sealing components should be cleaned, and the sealing surfaces must remain intact to prevent impurities and dust from entering those areas ； 3. During installation, it is strictly prohibited to strike or hit the component, to avoid damaging the mechanical seal friction pair and resulting in a loss of sealing performance ； 4. During installation, a layer of clean machine oil should be applied to the surfaces in contact with the seal to ensure smooth installation ； 5. When installing the static ring gland, the screws must be tightened evenly to ensure that the end face of the static ring is perpendicular to the axis line ； 6. After installation, pushing the moving ring by hand allows it to move freely on the shaft while exhibiting a certain degree of elasticity ； 7. After installation, turn the shaft by hand; it should not feel heavier or lighter in any way ； 8. The equipment must be filled with the medium before operation to prevent seal failure due to dry friction ； 9. For crystalline or granular media that are prone to caking, when the medium temperature exceeds 80ºC, appropriate flushing, filtering, and cooling measures should be taken; for various auxiliary devices, please refer to the relevant standards for mechanical seals ； 10. During installation, a layer of clean machine oil should be applied to the surfaces in contact with the seal. Special attention must be paid to the choice of machine oil, as it varies depending on the material of the auxiliary seals; this is to prevent the O-ring from expanding due to exposure to oil or from aging more rapidly, which could lead to premature failure of the seal ； 11. The runout of the sealed end face should not be greater than 0. 05mm; it is crucial to adjust the compression amount when installing the mechanical seal ； Also, as mentioned above, lubricants are strictly prohibited for the O-rings of EPDM! It can be posted directly; I’m posting it for you now, the attachment will not be kept. This post was last edited by 147258 on 2008-3-26 19:34]