Cylinder seals are very important components in hydraulic systems, used to prevent hydraulic oil leakage and maintain system pressure. According to their function and structure, cylinder seals can be divided into the following categories:
1. Piston Seals
Function: used to seal between the piston and the inner wall of the cylinder to prevent hydraulic oil from leaking from the high-pressure side to the low-pressure side.
Common types:
O-rings: the most common seals, with simple structure and easy installation.
U-rings: have better anti-extrusion performance and are suitable for high-pressure environments.
Y-rings: have better self-lubricating properties and are suitable for high-speed movement.
Gray rings (PTFE + O-rings): composed of PTFE and O-rings, with good wear resistance and low friction characteristics.
2. Rod seals
Function: used to seal between the piston rod and the cylinder end cover to prevent hydraulic oil from leaking from the inside of the cylinder to the outside.
Common types:
Step seals (PTFE + O-rings): composed of PTFE and O-rings, with good wear resistance and low friction characteristics.
V-ring: suitable for high pressure and high speed environment, with good anti-extrusion performance.
Dust ring: used to prevent external dust and impurities from entering the cylinder, usually used in conjunction with piston rod seals.
3. Guide Rings
Function: used to support the piston and piston rod, reduce friction and wear, and prevent eccentric movement.
Common types:
PTFE guide ring: has good wear resistance and low friction characteristics.
Nylon guide ring: has high strength and wear resistance.
4. Static Seals
Function: used for sealing between stationary parts such as cylinder end covers and flanges to prevent hydraulic oil leakage.
Common types:
O-ring: the most common static seal, suitable for various static connection parts.
Square ring: suitable for high pressure and large diameter static seals.
5. Dust Seals
Function: used to prevent external dust, impurities and moisture from entering the cylinder, protecting the piston rod and seals.
Common types:
Single lip dust ring: has a single sealing lip, suitable for general dust prevention requirements.
Double lip dust seal: has two sealing lips, better dustproof effect, suitable for harsh environments.
6. Buffer Seals
Function: used to reduce the impact of the piston at the end of the stroke and protect the cylinder and seals.
Common types:
Buffer ring: usually made of elastic material and installed at the end of the piston.
7. Rotary Seals
Function: used for sealing between the rotating shaft and the cylinder to prevent hydraulic oil leakage.
Common types:
Oil seal: suitable for sealing of rotating shafts, with good wear resistance and oil resistance.
8. Combo Seals
Function: combines the functions of piston seal and piston rod seal, usually composed of multiple seals.
Common types:
Gray ring + Step seal: combines the advantages of Gray ring and Step seal, suitable for high pressure and high speed environment.
9. Special seals
Function: used for sealing under special working conditions, such as high temperature, low temperature, corrosive media, etc.
Common types:
Fluororubber seals: suitable for high temperature and corrosive media.
Silicone rubber seals: suitable for low temperature environments.
Summary
Cylinder seals are classified mainly according to their functions, installation locations and material properties. Different types of seals play different roles in hydraulic systems to ensure the sealing performance and reliability of the system. Choosing the right seal is essential to improving the working efficiency of the hydraulic system and extending the life of the equipment.
Post time: Dec-30-2024