U-CUP seals: page 71
Hydraulic seals are dynamic sealing elements fitted to the pistons and rods of hydraulic cylinders, ensuring a seal under various pressure and temperature conditions, thereby preventing fluid leaks and maintaining working pressure.
High-quality seals also mean that there is no loss of cylinder efficiency and that no servicing is required.
Polyurethane and rubber seals from Hydraulic Seals Store are available in various sizes and profiles, and are delivered quickly throughout Romania.
Sealing components in hydraulic cylinders
Hydraulic seals fulfil two main functions.
They maintain pressure inside the cylinder and prevent external leakage of hydraulic fluid. They effectively seal both the piston and the rod. They are fitted to the piston to ensure actuating force by preventing fluid transfer between the cylinder chambers. On the rod, they also prevent oil leaks and protect the interior of the cylinder from contaminants.
The profile and material of the seals are selected according to the direction of pressure and the operating conditions.
Reducing hydraulic fluid leakage
A worn or unsuitable seal would cause hydraulic fluid leakage, reduce the cylinder’s force and lead to environmental contamination.
Therefore, by replacing them promptly, oil consumption is reduced and the cylinder’s service life is extended, whilst also preventing damage to other components.
Types and key features
Seals are manufactured in single, double or special profiles for high pressures. They are most commonly made from polyurethane, which is suitable for high pressures and is wear-resistant. Other materials used include NBR rubber, which can operate within a moderate temperature range, and mineral oils. For aggressive fluids or high temperatures, special materials such as FKM are recommended.
See also the categories for scrapers and guide strips for a complete hydraulic cylinder sealing solution.
Choosing the right seals
Select hydraulic sleeves based on the diameter of the rod or piston, the maximum working pressure, the fluid temperature and the type of hydraulic fluid. The sleeve profile must match the cylinder seat. For other components that seal the cylinder, please also see the piston seals category.
Advantages of buying hydraulic sleeves from the Hydraulic Seals Store
Hydraulic Seals Store offers hydraulic sleeves from stock at all times, in both standard and special profiles, at competitive prices, with fast delivery across Romania. Orders are placed online, and our team provides technical support. Purchase high-quality sleeves directly from our catalogue.
Frequently Asked Questions
How do I choose the right seals for hydraulic cylinders?
Select the seal based on the size of the piston or rod, the working pressure and the hydraulic fluid. The seal’s profile must match the cylinder seat. Our team can provide technical assistance to help you make the right choice.
What dimensions should I check before ordering?
Check the inner diameter, outer diameter and width of the sleeve, in accordance with the hydraulic cylinder’s specifications. These dimensions are marked on the sleeve itself or in the equipment documentation.
What materials are used for hydraulic sleeves?
Hydraulic sleeves are made from polyurethane (high pressures), NBR rubber (standard applications) or FKM (high temperatures or aggressive fluids). The choice of material depends on the operating conditions.
Can I buy hydraulic sleeves online with delivery?
Yes, all hydraulic seals in the Hydraulic Seals Shop catalogue can be ordered online, with fast delivery to your address in Romania.