What are the different types of mechanical seal

Mechanical seals may sound complicated, but they are not. Because of their advantages of low leakage and long life, mechanical seals are the predominant form of shaft sealing in these devices around the world. Do you know what kinds of mechanical seals are available?

This passage is going to talk about the followings of mechanical seal:

1) What is a mechanical seal?

2) What are the different types of mechanical seal?

3) Choose our best Mechanical seals

1) What is a mechanical seal?

A mechanical seal is a shaft sealing device for rotating machinery. For example, equipment such as centrifugal pumps, centrifugal machines, reactors and compressors. Since the drive shaft runs inside and outside the equipment so that there is a circumferential gap between the shaft and the equipment, the medium in the equipment leaks outward through this gap, and if the pressure inside the equipment is lower than atmospheric pressure, the air leaks into the equipment, so there must be a shaft seal device to stop the leakage. There are many types of shaft seals, and because mechanical seals have the advantages of low leakage and long life, mechanical seals are the most dominant shaft sealing method in the world for these devices.

Mechanical seal, also called end seal, is a device that prevents fluid leakage by at least one pair of end faces perpendicular to the axis of rotation, which are kept together and sliding relative to each other under the action of fluid pressure and compensating mechanism elasticity (or magnetic force) and the cooperation of auxiliary seal.

2) What are the different types of mechanical seal?

Mechanical seals belong to one of the precise and more complex mechanical basic components, which are key parts of various pumps, reaction synthesis kettles, turbine compressors, submersible motors and other equipment. Its sealing performance and service life depend on many factors, such as selection, precision of the machine, correct installation and use, etc.

Hydraulic seals have pressure requirements and require a certain degree of finish on the bonding surface, and the sealing components are mostly made of rubber, which achieves the sealing effect through the local deformation of the seal.

Let's take a look at the classification of mechanical seals and hydraulic seals.

According to the mechanical seal type can be divided into set seal series, light mechanical seal series, heavy mechanical seal series, etc. Hydraulic seals: there are lip seals, V-shaped seals, U-shaped seals, Y-shaped seals, YX-shaped seals and hydraulic cylinders commonly used combination seals are mainly lei rings, glei rings and stir seals.

Different mechanical seals differ in structural characteristics, media to be sealed, sealing chamber pressure, sealing chamber temperature and linear velocity. For more details, please contact our experts or visit our product description page.

3) Choose our best Mechanical seals

When purchasing maintenance seals, most users go by sample size and color, which only makes purchasing more difficult and does not always result in selecting the right product. The following procedures are recommended to improve the accuracy of your seal purchase.

1. Direction of motion - first decide on the direction of motion of the seal location, such as reciprocating, rotating, spiral or fixed.

2. Seal focus - for example, decide if the active point is in the ID for tie rod seals or in the OD for piston seals, etc.

3. Temperature rating - Consult the original machine operating instructions or evaluate the operating temperature according to the actual working environment to determine the material to be used. For the temperature rating, please refer to the following production user notes.

4. Size - Most users will buy from an old used sample, but after a period of use, the seal will be significantly affected by temperature, pressure and wear.

5. Pressure Rating - Check the data from the original mechanical use instructions or infer the working pressure rating by observing the softness and structure of the original seal.