When trying to choose between a gasket and seal, your first impression might be that they are the same thing. After all, they perform essentially the same function, right? In some ways, they are certainly the same, but there are some important differences that you should understand when deciding which one is right for your project. Gaskets seal a connection between two components or flanges that have flat surfaces, while seals are used between engine parts, pumps, and shafts that rotate.
Gaskets seal a connection between two components or flanges that have flat surfaces, while seals are used between engine parts, pumps, and shafts that rotate. Gaskets are used wherever a union or flange is required to prevent leaking. Gaskets are most commonly used as static seals.
Gaskets are manufactured using many different materials. Viton, Neoprene, Nitrile, Pure Gum Rubber, EPDM Butyl, and SBR are just a sampling of the most common rubber or elastomeric materials commonly used to manufacture gaskets. Gaskets can be manufactured from many more diverse products including treated fiber (vegetable Fiber), Cork, Cork and Rubber, Non-asbestos (Aramid fiber), Graphite, PTFE, or closed cell sponge when a highly compressible gasket is required.
Every time any equipment is taken apart and then reassembled, a new gasket should be used.
Gaskets are used in many industries including oil and gas, pulp and paper, electric generation, and transportation.
As already mentioned, seals are used between engine parts, pumps, and shafts that rotate rather than those that are static. This type of seal is generally a molded or machined product. Seals tend to be flat and round, while gaskets are often cut into different shapes so that they fit the components. Most seals are made of an outer ring that is metal and nests over an inner surface that is often made of rubber. The inner circle is tilted just a bit, which creates a lip for the seal. The lip is designed as a second barrier against any drops that manage to get past the first edge of the seal. It is essential that seals be installed correctly because, if it’s installed backward, you could end up with a leaky mess on your hands.
Common uses for seals include keeping leaks from occurring at the end of the shaft where it comes out of the cover and sealing hydraulic lines. This type of seal is generally a molded or machined product. Seals are often used in bearings, which is basically just a ball bearing surrounded by a rubber seal, which keeps it from leaking and sometimes reduces the amount of noise that occurs during operation.
When installing the seal, it’s usually fitted into the hole by a press and then tapped further in using a hammer. Lubrication is usually necessary to keep the crankshaft from damaging the seal as it goes through it.
When a seal breaks down, the entire bearing must be replaced rather than just the seal.
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Seals are generally moulded or machined product, often flat and round such as an O-ring. Gaskets are cut into different shapes so that they fit the design and bolt spacing of a component.
Gaskets are used to seal two components or flanges that have a flat surface. Seals are used to describe parts that are used between engine parts, pumps and shafts that rotate. Gaskets are used as static seals.
When a seal is used between engine parts, pumps and shafts that rotate, it is described as a dynamic seal. Seals are required to keep leaks from occurring within a moulded or machined product.
When a gasket breaks down or a machine is serviced the gaskets need replacing. A seal within a bearing needs complete replacement of both the seal and bearing if there is a seal breakdown.
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