Common self-sealing compression-type hydraulic seals primarily include O-rings, circular seals, and rectangular seals. These seals feature simple structures, ease of manufacturing, and low costs, making them widely used dynamic and static sealing components in hydraulic transmission systems. When installed in sealing grooves, they typically undergo 15~25% radial compression deformation and generate high initial contact stress on the sealing surfaces, thereby preventing leakage of pressurized fluids.
Selecting Hydraulic Seals:
When purchasing maintenance-grade seals, most users tend to buy based on the sample's dimensions and color, which only complicates the procurement process and may not guarantee the selection of suitable products. The following procedures are recommended to enhance the accuracy of seal procurement:
1. Direction of movement
First determine the movement direction of the sealing component, such as reciprocating, rotating, helical, or fixed.
2. Sealing Key Points
For example, the movement point is located at the internal diameter rod seal or the movement point is located at the external diameter piston seal.
3. Temperature Class
Refer to the original manufacturer's mechanical instruction manual or evaluate the operating temperature based on the actual working environment to determine the required materials. For details on temperature ratings, please refer to the Production User Notes below.
4. Pressure Rating
Refer to the original manufacturer's mechanical instructions for relevant data, or infer the working pressure rating by observing the softness and structure of the original sealing components. For details on pressure ratings, please consult the production user precautions below.
5. Size
Most users will select based on used old samples, but after a period of use, sealing components can be significantly affected by factors such as temperature, pressure, and wear, which alter their original dimensions. Relying on samples should only serve as a reference. A more accurate method is to measure the dimensions of the metal groove where the sealing component is located.
Production User Notes:
The common causes of damage to sealing components are largely the same as the operational requirements for these components
1. Hardening
One of the leakage causes of sealing components is the hardening of the material itself due to temperature influence. When the hardness becomes excessively high, the sealing component fails to fill the gap between the mating parts, resulting in leakage.
2. Wear
The wear of seals involves factors such as the surface finish of mating parts, motion speed, and transmission media, with different sealing materials suitable for varying motion speeds.
3. Extrusion
When the sealing component is subjected to excessive pressure, it can be extruded into the metal gap, damaging the sealing component and causing leakage. This situation involves the hardness of the sealing component itself and whether the metal gap is excessively large. Improper handling in design, selection, processing, or installation can lead to extrusion damage.
4. Corrosion
The observed condition is the softening or even dissolution of the sealing element, caused by media intrusion and material selection errors. Special attention must be paid when the media contains water or solvents.
2026 August 2nd Week VAFEM Product Recommendation
VAFEM Hub units are designed to allow rear wheels, especially in passenger cars, to turn on an axle even under heavy loads.
Features:
magnetic, electric, and mechanic ABS
with and without ABS
flange only
Steel Material: GCr15/52100/100Cr6
Steel Type: Forged
Ball Grade: G10
Grease: Shell
2026-08-14