Why does a small flange gasket play a big role

<p>A <a href="https://www.jdoseal.com/jdseal-dn40dn50dn100-silicone-rubber-ptfe-the-flange-gasket" rel="noopener noreferrer" target="_blank">flange ring gasket</a>&nbsp;is a mechanical seal between two objects. If the selection is correct, the material leakage between the two objects can usually be prevented; improper selection will cause unnecessary losses. Jiadong brings you the selection method and installation precautions of flange gaskets, let's learn together.</p><p><br></p><p>Flange ring gasket&nbsp;sealing mechanism</p><p>The leakage that occurs when the medium flows through the interface between the internal space and the external space is the leakage of the sealing surface. The root cause of leakage is that there is a gap on the contact surface, and the pressure difference and concentration difference on both sides of the contact surface are the driving force for leakage.</p><p>Install the contact surface as much as possible, that is, reduce the cross-sectional area of the leakage channel, increase the leakage resistance, and make it greater than the leakage driving force to reduce leakage. Applying a compressive load to the sealing surface to generate a compressive force can increase the degree of contact of the sealing surface. When the stress is increased enough to cause significant plastic deformation of the surface, the gap of the sealing surface can be filled and the leakage channel can be blocked.</p><p><br></p><p>Initial seal</p><p>After the flange ring gasket&nbsp;is assembled, the initial seal can be completed, and the bolts are tightened to compress the gasket. The basic condition of the initial seal is to generate sufficient pressure between the sealing surfaces, that is, the pre-tightening stress of the gasket causes the gasket material to be compressed. Subsequently, elastic compression deformation or elastoplastic compression deformation occurs, which can fill the roughness sealing surface of the flange and block the interface leakage channel to meet the initial sealing requirements.</p><p>The pre-tightening stress of the gasket depends on the compression properties of the gasket material. All seal compression force comes from the initial tightening force of the bolt. At the same time, the flange should have sufficient strength and rigidity to prevent deflection or warping deformation.</p><p><br></p><p>Working seal</p><p>The pre-tightened three-component system of flange ring gasket&nbsp;bolts will force the two sealing surfaces of a pair of flanges to be relatively separated when bearing the pressure of the working medium. At this time, the gasket should have sufficient rebound deformation to compensate for this separation.</p><p>Not only that, the gasket also needs to maintain sufficient residual gasket stress on the sealing interface to ensure that the fluid medium is sealed.</p><p><br></p><p>The main factors affecting flange sealing are: bolt pre-tightening force, sealing surface form, gasket performance, flange stiffness, and operating conditions.</p><p><br></p><p>The compression and resilience of the gasket are necessary conditions for flange sealing. The deformation of the gasket includes two parts: elastic deformation and plastic deformation. Gaskets with high resilience can better compensate the separation of flange end faces and adapt to fluctuations in working pressure and working temperature. Therefore, the sealing performance is good.</p><p><br></p><p>The plastic deformation ability of the gasket surface is also very important. It can better fill the microscopic unevenness on the end surface to achieve the initial seal between the flanges.</p>