Choose O-rings For Reliable Sealing Under Pressure

How Do O-Rings Differ From Gaskets?

Within the broad field of gaskets, O-rings stand out as a type of mechanical gasket that serves as a seal between two parts. Its rounded doughnut-like shape is considered a torus, as it is made of a loop that has a round cross-section that sits in a groove and compresses under pressure to create a seal. Used in static or dynamic applications where there is motion, the O-ring is a simple and reliable seal that is often highly engineered to perform in a certain way. Because an O-ring requires a smaller point of contact between the seal and the parts, it is appropriate for use in very small spaces.

What Is A Gasket?

The term "gasket" applies to any mechanical seal used between two surfaces that mate together. Their purpose is to prevent leakage from the space between two parts that are compressed together, even if the objects do not fit together perfectly. Depending on the application, gaskets can be made of a variety of materials including metal, cork, silicone, felt, neoprene, fiberglass, compressed fiber, graphite, paper, and a variety of synthetics. They can come in virtually any shape, so that they can look like a sheet cut to size for a particular application, or be more like a small part.

There are three basic configurations of gaskets:

  • Round or cross-section gaskets and seals are molded or extruded in a round shape that creates a higher load point that requires a low compressive force to keep the seal in place. The result is to make a better seal. The O-ring is the most common example of a round gasket.
  • Rectangular gaskets are large enough to cover the whole mating surface where parts are brought together. More force is needed to compress this type of gasket, which is often die or laser cut for quick and easy production.
  • Reciprocating gaskets molded of rubber or synthetics, are used in applications to reduce friction. The production process makes them more expensive as there is a high start-up cost to designing and creating the mold.

The Advantage Of O-Rings

While O-rings can be made in many materials, those extruded from elastomers excel in sealing under high pressure conditions. Each one is placed within a gland made of metal or other rigid material that contains or supports the O-ring to constitute an O-ring seal assembly. The assembly prevents pressure sapping loss of fluid or gas in many applications. While they can be used in static applications, their great advantage is that they can be used in dynamic applications, such as rotating shafts.

Contact Performance Seal For Quality Parker O-Rings

When considering O-rings for your application, Performance Seal offers high quality Parker O-rings for use in many industries, such as aerospace, climate control, electron mechanical, filtration, fluid and gas handling, hydraulics, pneumatics, process control, and sealing and shielding. Click here for a catalog or contact us via our website.

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