Hydraulic Seals
Hydraulic seals are designed to seal areas between the components inside a hydraulic cylinder. A hydraulic cylinder contains many different components, some of which are exposed to high pressure, high temperature and fluids. Hydraulic seals are designed to fit the specific components in a hydraulic cylinder while creating a leakproof seal around them.
Static vs dynamic hydraulic seals
Hydraulic seals are either static or dynamic, depending on their application. Both seal types are used in hydraulic cylinders; the difference being that static seals remain stationary, whereas dynamic seals are exposed to motion.
Static hydraulic seals
Used in applications where the element with which it’s used doesn’t move. Static hydraulic seals are not exposed to movement, but they are able to withstand high pressure.Dynamic hydraulic seals
Dynamic seals are exposed to movement. For example, rod seals are a type of dynamic hydraulic seal. A piston rod is a moving part, and rod seals are designed to seal these piston rods.
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Hydraulic seal materials
Materials include:
- Rubber: Elastic, resistant to cracking and long-lasting.
- Polyurethane: Many of the same qualities as rubber, but typically stronger and better protected against wear.
- Polytetrafluoroethylene (PTFE): A synthetic material that’s flexible, strong, and resistant to extreme temperatures.
All of these materials are able to withstand high pressure and high temperatures, have excellent sealing capability against leaks and have good chemical compatibility.
Overview of hydraulic seal types
Piston Seals
Piston seals prevent fluid or other media bypassing the piston as the system pressure pushes the piston down the cylinder during a pressure cycle. They are generally single-acting seals, which means the stress acts only on one side; and double-acting seals, which means the stress acts on both sides.Rod Seals
Rod seals are one of the most substantial components of a cylinder sealing configuration. The seals help prevent pressurised hydraulic fluid within the cylinder from leaking as well as keeping dirt and contaminants out of the cylinder, which extends the lifespan of the cylinder.Wiper Seals
Wiper seals (also called scraper seals) generally are used together with other sealing components such as the rod seal. Their function is to scrape off dirt from the rod and prevent dirt entering the cylinder.Wear Rings
Wear rings (also called guide-rings) are used to keep the piston centralised. Wear rings are used together with rod and piston seals to ensure even wear and stress on the seals.Buy hydraulic seals
Our seals for hydraulic and pneumatic cylinders have manufactured properties that include ultra-low friction, wide temperature range, water resistance, and ultra-long life. See our selection online, contact us for a quote or read more about our bespoke hydraulic seals.