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Dongguan Minz Rubber & Plastics Co., Ltd.

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O-ring seal material "pressure" influence?

Release time:

2019-06-10 12:30

Source:

O-ringThe influence of "pressure" of materials?
 
O-ringThe common Shore hardness is 50-90 (hardness unit, a standard for material hardness).
According to the sealing principle of the O-ring, when the system pressure is low, it is recommended to use the O-ring with high hardness. When the working pressure exceeds 10MPa, it is best to use the retaining ring to prevent the O-ring from being squeezed into the sealing gap and deformed when the pressure is high.
 
In addition, when the pressure is high, the O-ring is prone to "implosion", that is, the O-ring is under high pressure for a long time, and the high-pressure gas molecules penetrate into the O-ring. When the external pressure of the O-ring is reduced instantly, the internal high-pressure gas molecules are easy to break the O-ring due to rapid diffusion. In particular, the O-ring at the seat seal, when the safety valve is opened, the instantaneous release of pressure is easy to cause the O-ring here to produce "implosion". Therefore, under high pressure conditions, it is recommended that the O-ring here should be a high compactness O-ring or an implosion-proof O-ring.
 
Failure Caused by "Curl" of O-ring and Measures?
O-ring is a circular cross-section ring rubber sealing ring, Dongsheng seals tell you mainly used for mechanical parts in static conditions to prevent the leakage of liquid and gas medium. In some cases, the O-ring can also be used as a dynamic sealing element for axial reciprocating motion and low-speed rotating motion. According to different conditions, different materials can be selected to adapt to it. Of course, it is also the reason for the failure of the O-ring. First of all, let's find out the reason for the failure of the O-ring caused by the "curling" phenomenon after the operation of the sealing ring. What are the countermeasures to solve?
 
O-ring seal failure causes and countermeasures: sealing ring "curl" how to do?
1. Failure state: O-ring is obviously curled;
2. Reasons for failure: caused by installation, the movement speed is too low, the material is too hard or the elasticity is too small, the surface treatment of the O-ring is uneven, the groove size is uneven, the groove surface is rough, and the lubrication is insufficient;
3. Solution: correct installation, high elastic materials, appropriate to improve the design of the groove and the degree of surface finish, try to use the support ring.
 
The pump uses fully covered O-ring to learn more about the problem of O-ring, which is in Mingzhen Silicone Products Factory! This article comes from the network sharing, the copyright belongs to the original author, if there is infringement please inform, within 24 hours immediately offline!

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