The working principle and types of seals


2022-08-24 10:27

The surface roughness value of rigid (metal) components in hydraulic components cannot be lower than the size of liquid molecules, regardless of machining.

Detailed introduction

The surface roughness value of rigid (metal) components in hydraulic components cannot be lower than the size of liquid molecules, regardless of machining.
So, even if two components can be compressed without relative motion, it is inevitable that only a portion of the area will actually come into contact.
If two components need to move relative, it is even more necessary to leave some gaps.
Hydraulic oil may flow through these gaps, causing leakage, especially when the pressure is high and the viscosity is low.
In order to prevent leakage, seals can be set between adjacent rigid surfaces, and seals are used for almost all Almost all hydraulic components.
The vast majority of seals are made of natural rubber or artificially synthesized polymer materials, which have a certain degree of elasticity.
Flexible sealing ring, blocking through pre compression deformation and compression deformation.
During installation, local deformation occurs through preloading, which is further compressed when subjected to hydraulic pressure. It is expected that the actual contact area formed can completely isolate or at least significantly reduce the passage of liquid flow leakage.
The actual condition of the contact area depends on the roughness of the contact surface, the shape, hardness, and clamping force of the sealing element.
A static seal is set between components that do not have relative motion but wish to be detachable.
The dynamic seal is set between components with relative motion.

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