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The function of the seal is to stop the leak. Effectively preventing the leak is the most important requirement of the seal. Sealability reflects the level of control over the leak. Friction is an important factor related to the quality of a sport when it comes to moving seals. Sealing and friction always restrict each other. In general to improve the sealing will bring increased friction, increased friction directly results in decreased ability and quality of movement; and friction will accelerate the seal wear. Friction can also be a major part of the load on low-voltage systems. The resistance of the seal reflects the maximum pressure of the working medium that can be sealed and is an important indicator of the hydraulic pneumatic seal. The basic requirements of the seal can be summarized as: 1) sealing performance. 2) Frictional properties. 3) pressure resistance. 4) life expectancy. 5) installation performance. 6) economy. The sealing performance, friction performance, pressure performance is an independent performance, the combination of these three properties has been the overall performance of the seal; overall performance of the holding time is the life of the seal; the actual design of the installation performance and economy Should also be used as an important indicator. The comprehensive performance of the seal is not only related to the performance of the seal itself, but also related to the multiple conditions of use of the seal. Therefore, considering the performance of the seal depends on the performance of the seal or the seal combination itself, and is also called the monomer performance. To see the seal into the hydraulic, pneumatic components after the actual sealing performance, known as the actual sealing performance. Seal monomer performance has the following: 1, friction Friction is related to the performance characteristics of sports, sports seal friction is divided into static friction (initial friction) and dynamic friction (sliding friction) two. Friction by the sliding surface roughness, sliding speed and working pressure, seal lubrication, placement time and many other factors, prone to great changes. Friction calculation is more difficult and should be obtained experimentally. Static friction by a variety of factors, the measurement error is relatively large, the measured value can only be used as a reference. In contrast, dynamic friction can obtain more stable and important measurements. 2, wear resistance Wear resistance is a great seal on the life of the characteristics, and friction performance, it is affected by many factors. Especially pneumatic seal, poor lubrication, wear resistance as the main indicator of longevity. For seals made of synthetic rubber or synthetic resin, the wear resistance of the seal can be basically evaluated based on the wear resistance of the material. But not necessarily consistent with the actual results of the seal, because there are many factors that affect the wear and tear in use. Therefore, the evaluation of the wear resistance of the seal product makes it more meaningful to seal the abrasion resistance when actually used in the component. 3, anti-eccentricity in the dynamic seal, due to the mating surface of the components with the tolerance, there will be gaps. This gap in the case of load and vibration, can cause shaft eccentricity, affect the sealing performance. To this end, seals on such eccentric must also ensure adequate compensation performance. In addition, since the elasticity of the seal made of synthetic rubber is lowered at low temperatures, the ability to follow the eccentricity is reduced, and the more the temperature is, the more the eccentricity can reflect the sealing performance at low temperatures. 4, the contact stress seal by a certain amount of contact stress to ensure that the seal in the deformation conditions must ensure adequate resilience. Contact stress determines the shape of the oil film, the sealing performance and friction, sports performance has a reference value. Seals real machine performance should be investigated: 1, sealing performance Sealing performance is the most important seal and sealing device requirements. The amount of leakage at the seal ring is an indicator of seal performance. Affect the sealing performance is not only the seal, but a variety of seals installed, with the seal coupling surface of the various elements of the combination of the entire seal. 2, anti-eccentricity performance Here is considered after the actual gap beating, and imposed some eccentric load eccentricity performance. 3, friction (minimum working pressure) The actual application of friction is the minimum working pressure to assess the size. For the reciprocating seal, the starting friction is greater than the dynamic friction, more complicated, and affect the starting performance. It is of practical significance to measure the sealing friction with the lowest starting pressure. Therefore, for the dynamic seal is generally given the minimum working pressure. 4, the comprehensive performance of the overall performance requirements of the sealing device in the specified working conditions, to meet the above performance requirements, and work for some time, so this indicator also reflects the seal is generally given the minimum working pressure.
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