If the Flanged hose coupling is in a vibration, high pressure or corrosive medium environment for a long time, how will the sealing performance of the O-ring change?

When the equipment is in a vibrating state, the O-ring inside the Flanged hose coupling will produce continuous micro-motion friction with the sealing surface. This micro-motion effect may seem small, but after a long period of accumulation, it will cause significant damage to the surface integrity of the O-ring. For example, tiny cracks or gaps may appear on the surface of the O-ring. These subtle damages will gradually expand and eventually form leakage channels, causing the sealing performance of the Flanged hose coupling to drop significantly. In addition, vibration will also cause changes in the preload of the O-ring. The preload originally applied evenly to the sealing surface may become uneven or even reduced due to vibration, making the compression rate of the O-ring unable to meet the design requirements. When the compression rate is insufficient, an effective sealing barrier cannot be formed between the sealing surfaces, and the medium is easy to leak out of the gap. At the same time, high-frequency vibration will accelerate the fatigue aging process of the O-ring material. The molecular structure inside the material gradually changes under repeated stress, the elasticity decreases, and the hardness increases, further weakening the sealing ability of the O-ring.

Under long-term high pressure, the O-ring material will be permanently deformed. This deformation will cause the shape and size of the O-ring to change, making it no longer fit tightly with the sealing surface. For example, the originally regular circular cross-section may become flat due to high pressure, and the contact pressure on the sealing surface is unevenly distributed, causing leakage problems. In addition, high pressure also increases the risk of the O-ring being squeezed out of the sealing gap. When the sealing gap is too large or the hardness of the O-ring is not enough to resist high pressure, the O-ring may be squeezed out of the sealing area by pressure, resulting in sealing failure. Moreover, the high-pressure environment will accelerate the aging process of the O-ring material. The chemical bonds inside the material are more likely to break under high pressure, and the molecular chain degrades, causing the elasticity, chemical resistance and other performance indicators of the O-ring to gradually decrease.

Corrosive media will directly react chemically with the O-ring material, causing its surface corrosion. In addition, some corrosive media will also cause chemical degradation of the O-ring material. The molecular structure inside the material is destroyed and the performance deteriorates, causing the O-ring to lose its sealing ability in a short time. This chemical degradation will not only accelerate the aging of the O-ring, but also pose a serious threat to the sealing system of the entire flange hose joint.

In practical applications, Flanged hose couplings are often in a comprehensive environment of vibration, high pressure and corrosive media. The synergistic effect of these environmental factors will accelerate the failure process of the O-ring. For example, vibration will make the O-ring contact with the corrosive medium more fully, thereby intensifying the corrosion effect. During the vibration process, the tiny damage on the surface of the O-ring provides a channel for the invasion of the corrosive medium, making the corrosion reaction more likely to occur. At the same time, high pressure will make it easier for the corrosive medium to penetrate into the interior of the O-ring, and react more deeply with the material, resulting in a sharp decline in material performance. In this comprehensive environment, the sealing performance of the O-ring will show a trend of accelerated degradation.