Installation and Use Requirements of Mechanical Seal

Author:Site Editor     Publish Time: 2020-09-28      Origin:Site

1. Mechanical seal requirements for machine accuracy (take mechanical seal for pump as an example)

(1) The maximum radial runout tolerance of the shaft (or sleeve) where the mechanical seal is installed does not exceed 0.04~0.06MM.

(2) The axial movement of the rotor does not exceed 0.3MM.

(3) The maximum runout tolerance of the positioning end facing the shaft (or sleeve) surface of the sealing cavity and the sealing end cover shall not exceed 0.04~0.06MM.


2. Confirmation of mechanical seals

(1) Confirm whether the installed mechanical seal is consistent with the required model.

(2) Check carefully with the assembly drawing before installation, and check whether the number of parts is complete.

(3) The mechanical seal is driven by a parallel spring. The spring can be divided into left and right rotation, which must be selected according to the rotation direction of the shaft.


3. Installation

The installation method varies with the type of mechanical seal and the type of machine, but the installation essentials are almost the same. The installation steps and precautions are as follows:

(1) Determination of installation size

During installation, the installation size of the mechanical seal should be guaranteed according to the product's instruction manual or sample.

(2) Before installation, the shaft (sleeve) and gland should be punctured, and the bearing is in good condition. The seals, shaft, seal cavity, and gland should be cleaned. In order to reduce the friction resistance, the part where the mechanical seal is installed on the shaft should be coated with a thin layer of oil for lubrication. Considering the compatibility of the rubber O-ring, if it is not suitable to use oil, soapy water can be used. Floating static ring has no anti-rotation pin structure, so it is not suitable to be oiled and should be dry installed in the gland.

mechanical shaft seal

(3) Install the static ring and gland on the shaft first, taking care not to collide with the shaft, and then install the moving ring assembly. The set screws of the spring seat or transmission seat should be evenly tightened in several times.

Before fixing the gland, push the compensation ring by hand to compress it axially. After loosening, the compensation ring can automatically rebound without jamming, and then evenly lock the gland bolts.


4. Use

(1) When the temperature of the conveying medium is too high, too low, or contains impurity particles, is flammable, explosive, or toxic, corresponding measures such as sealing, washing, cooling, and filtering must be taken.

(2) Before operation, turn the mechanical seal by hand, pay attention to whether the torque is too large, there is no rubbing and abnormal sound.

(3) Pay attention to the direction of rotation, whether the coupling is aligned, whether the lubricating oil at the bearing part is added properly, and whether the piping is correct.

(4) Before operation, first open the medium and cooling water valve, check whether the gas in the sealed cavity is completely discharged to prevent leakage caused by static pressure, and then start the operation.

(5) Whether the work is normal and stable after driving, whether there is abnormal torque caused by shaft rotation, abnormal noise and overheating.


WenDong, as China famous mechanical seals manufacturers, provides professional mechanical seals knowledge and high-quality standard mechanical seals. If you have any needs, please contact us now!


WenDong specializes in produce mechanical seals and custom mechanical seals solutions. By utilizing our extensive expertise, we can provide a complete solution to your challenge.

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