Friday, 18 April 2014
Definition
A Mechanical Seal is a device which helps join systems or mechanisms together by preventing leakage, containing pressure, or excluding contamination.A seal may also be referred to as 'packing'.
Piston Ring
The piston ring is a split ring, usually made of cast iron, that fits into a groove on the rim of a piston to provide a spring-loaded seal against the cylinder wall
The gap in the piston ring compresses to a few thousandths of an inch when inside the cylinder bore.
The gap in the piston ring compresses to a few thousandths of an inch when inside the cylinder bore.
Garter Spring
Garter spring is a coil spring tied end-to-end to provide a clamping force around an object. They are often used to maintain the function of radial shaft seals by keeping the elastomer seals tight against the rotating shaft.
Labrinth Seal
A labyrinth seal is a type of mechanical seal that provides a tortuous path to help prevent leakage. An example of such a seal is sometimes found within an axle's bearing to help prevent the leakage of the oil lubricating the bearing.
A labyrinth seal may be composed of many grooves that press tightly inside another axle, or inside a hole, so that the fluid has to pass through a long and difficult path to escape.
A labyrinth seal may be composed of many grooves that press tightly inside another axle, or inside a hole, so that the fluid has to pass through a long and difficult path to escape.
Gasket 3-D
This picture shows a gasket (orange) bieng used as a face seal to prevent flow from escaping from a pipe flaunt joint.
Gaskets
- A gasket is a seal that fills the space between two mating surfaces, generally to prevent leakage from or into the joined objects while under compression.
- Gaskets are commonly produced by cutting from sheet materials, such as gasket paper, rubber, silicone, metal, cork, felt, neoprene, nitrile rubber, fiberglass, or a plastic polymer (such as polychlorotrifluoroethylene).
- A few gaskets require an application of sealant to the surface to function properly.
The O-Ring
- An O-ring is a mechanical gasket in the shape of a torus.
- It is designed to be seated in a groove and compressed during assembly between two or more parts, creating a seal at the interface.
- O-rings are one of the most common seals used in machine design because they are inexpensive, easy to make, reliable, and have simple mounting requirements.
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