Classification and difference between mechanical seals and hydraulic seals

Generally, it is difficult for people to distinguish between mechanical seals and hydraulic seals, and they often think that they are the same object.

1. Definition of mechanical seals and hydraulic seals:

Mechanical seals are one of the basic mechanical components with precision and complex structure. They are the key components 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 type selection, machine accuracy, correct installation and use, etc.

Hydraulic seals have pressure requirements and require a certain degree of smoothness on the joint surface. The sealing elements are mostly rubber, and the sealing effect is achieved through the partial deformation of the seal.

Second, classification of mechanical seals and hydraulic seals

Mechanical seal model: cartridge seal series, light mechanical seal series, heavy mechanical seal series, etc.

Hydraulic seals: lip seals, V-shaped seals, U-shaped seals, Y-shaped seals, YX-shaped seals, and hydraulic cylinders. The commonly used combination seals are mainly Lace-shaped rings, Glec Special seal.

Three, choose the seal

When purchasing seals for maintenance, most users will buy them according to the size and color of the samples, which will only increase the difficulty of purchasing, and may not be able to select the right products. The following procedures are recommended to improve the accuracy of procurement of seals:

1. Movement direction-first determine the movement direction of the location of the seal, such as reciprocating, rotating, spiral or fixed.

2. Sealing key points-such as determining whether the active point is the tie rod seal with the inner diameter or the piston seal with the outer diameter.

3. Temperature grade-consult the original machinery operating instructions or evaluate the working temperature according to the actual working environment to determine the materials needed. For the description of temperature levels, please refer to the following notes for production users.

4. Size-Most users will buy according to used old samples, but after a period of use, the original size of the seal will be greatly affected by factors such as temperature, pressure and abrasion, so you can only choose according to the sample As a reference, a better method is to measure the size of the metal groove where the seal is located. The accuracy will be higher.

5. Pressure level-refer to the relevant data from the original machinery instructions, or infer the working pressure level by observing the hardness and structure of the original seal. For the pressure level description, please refer to the following notes for production users.