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Credibility ,The normal force acting on the unit contact surface between sealing surface is called the sealing specific pressure. The sealing surface specific pressure is an important factor affecting the sealing performance of gaskets or packing. Usually, by applying pre-tightening force on the sealing surface to produce a certain specific pressure, so that the deformation of the seal to reduce or eliminate the gap between the sealing contact surfaces, to prevent the flow through, to achieve the purpose of sealing. It should be pointed out that the effect of fluid pressure will change the relative pressure of the sealing surface. Although the increase of specific pressure of sealing surface is beneficial to sealing, it is limited by the extrusion strength of sealing material. For dynamic sealing, the increase of specific pressure of sealing surface will also cause the corresponding increase of friction resistance.
Influence of external conditions: vibration of pipeline system, deformation of connecting components, offset of installation position and other reasons will produce additional force on the seal, thus causing adverse effects on the seal. Especially, vibration will cause periodic changes in the pressure between the sealing surfaces, so that the connection bolt relaxation, resulting in seal failure. The cause of vibration may be external or possibly caused by fluid flow inside the system. In order to make the seal reliable, the above factors must be carefully considered, and the manufacture and selection of gaskets and fillers are very important.Tel No:+86-18267732328 / Email:[email protected]
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