Hydraulic seals are important components to prevent fluid leakage in hydraulic systems and ensure the efficient operation of the system. According to different standards, hydraulic seals can be divided into multiple categories. The following are some of the main categories:
Functional classification
According to the function and the location of the seal, it is classified as follows:
Piston seal
Isolates different chambers in the hydraulic cylinder to prevent internal leakage of hydraulic oil and oil mixing.
Piston rod seal
Prevents hydraulic oil from leaking from the piston rod to the outside of the system and maintains system pressure.
Wiper seal
Prevents external dust and other impurities from entering the hydraulic system and protects the seals in the system. This article can help you get the dust ring price guide.
Guide ring
Helps guide the linear motion of the piston to prevent metal-to-metal collision.
Backup ring
Prevents O-rings from being squeezed and damaged under high pressure and large gaps
Buffer seal
Provides a buffering effect when the piston approaches the end of the stroke.
Rotary seals
Rotary seals are used to seal rotating shafts, usually including rotary seals, rotary flat seals, etc.
Sealing state classification
According to whether the seal has direct contact with the moving parts or a static state,
Dynamic seal
Applicable to parts with relative movement, participating in movement, such as piston seals, rod seals, etc.
Static seal
Applicable to parts without relative movement, not participating in movement, such as O-rings.
Shape classification
Classified according to the appearance and shape of the seal design, different equipment meets different equipment and working conditions.
O-ring
The cross-section is circular and is mainly used in static sealing situations.
Y-ring
The cross section is Y-shaped and is mainly used for dynamic sealing.
V-ring
The cross section is V-shaped; usually, multiple V-rings are used in groups, suitable for dynamic sealing under high pressure.
U-ring
Similar to the Y-ring, but the cross section is U-shaped, also known as a U-cup seal.
YX-ring
An improved Y-ring designed for high-pressure environments.
Lip seal
Designed with a lip-shaped appearance, it has one-way or multi-way sealing capabilities and is suitable for sliding surfaces.
Material classification
It can also be divided into rubber, polyurethane, polytetrafluoroethylene, etc., according to the material. Different materials correspond to different heat resistance, pressure resistance, wear resistance, and other properties.
PTFE seals
PTFE seals made of polytetrafluoroethylene or modified PTFE materials have excellent low friction, chemical corrosion resistance, and high temperature resistance, and the products are wear-resistant and durable.
PU seals
PU seals made of polyurethane materials have excellent high extrusion resistance, high wear resistance, and good temperature stability.
Rubber seals
Rubber seals are made of rubber materials; common rubbers are NBR, HNBR, and FKM, generally used for elastomers, and the specific material selection depends on the actual working conditions.
In summary, there are various types of hydraulic seals, and each kind of seal has its unique hydraulic seal application occasions and performance advantages. In order to ensure the normal operation of the hydraulic system and extend the service life of related equipment, it is very important to choose the right hydraulic seals.
If you are looking for high-quality hydraulic seals, TYS seals are your wise choice. TYS is a leading hydraulic seal manufacturer in China with 30 years of experience in hydraulic seals. Based on material development, it provides efficient solutions for multi-field applications and provides you with customized sealing solutions and floating oil seals for harsh working conditions.
