The O-ring seal is a rubber ring with a circular cross-section. Since its cross-section is in the shape of an "O", it is called an O-ring seal. It is one of the most widely used seals in hydraulic and pneumatic transmission systems.
The O-ring seal is a circular rubber sealing ring with a circular cross-section, mainly used to prevent the leakage of liquid and gas media for mechanical components under static conditions. In some cases, the O-ring seal can also be used as a dynamic sealing element for axial reciprocating motion and low-speed rotary motion. According to different conditions, different materials can be selected respectively to adapt to them.
When selecting an O-ring seal, it is usually advisable to choose an O-ring with a large cross-section as much as possible. Under the condition of the same clearance, the volume of the O-ring seal squeezed into the clearance should be less than its maximum allowable value for being squeezed in.
For different types of fixed seal or dynamic seal application scenarios, the O-ring seal provides designers with an effective and economical sealing element. The O-ring is a bidirectional acting sealing element. The initial radial or axial compression during installation gives the O-ring its own initial sealing ability. The sealing force generated by the system pressure and the initial sealing force are combined into the total sealing force, which increases with the increase of the system pressure. The O-ring seal shows a prominent role in static sealing scenarios. However, in appropriate dynamic scenarios, the O-ring seal is also often applied, but it is limited by the speed and pressure at the sealing position.
Compression amount
Many simple seals (such as O-rings) particularly rely on the compression amount to achieve sealing. The compression amount is ensured by the matching of the groove depth and the clearance size. Excessive compression amount should be avoided because it will cause too high material stress, resulting in premature aging, and in the case of dynamic seals, it will lead to unnecessary high friction. However, in static seals, in order to increase the rated pressure, a large compression amount may be deliberately adopted.
Technical data
Pressure:
Speed:
The maximum reciprocating speed in static scenarios can reach 0.5m/s.
Without a retaining ring, the maximum achievable pressure is 20mpa, and the maximum rotational speed can reach 2.0m/s.
With a retaining ring, the maximum achievable pressure is 40mpa.
Medium and temperature:
With a special retaining ring, the maximum achievable pressure is 200mpa.
Dynamic pressure
Maximum compression amount:
Without a retaining ring, the maximum reciprocating motion can reach 5mpa. Static seal: 20% of the diameter of the O-ring.
With a retaining ring, for high-pressure dynamic seals: 30% of the diameter of the O-ring.
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