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several factors that affect the sealing performance

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Author : Toparts
Update time : 2020-07-02 12:17:55
When the velocity of movement is excessive low (<0.01 m/s)・ both the operating smoothness of the equipment and whether acreepingw phenomenon would be occurred or not should be considered.
When the velocity of movement Is excessrve high (>0.S m/s), the oil film that plays a lubricating role may be damaged, Thus, the oil seal may become hot due to friction without good lubtollor, and Rs service life shall be significantly decreased .The range of the velocity of urethane or rubber oil seal is suggested to be 0,03 m/s~0.8 m/$.
2.    Temperature
Under low temperature, the plasticity of urethane or rubber oil «9i may be decreased, thus cau$e$ leakage and even the whole oil seal shall became hard and brittle. While at high temperature, the oil seal may expand and become soft, which results in sharply increasing of frictional resistance and decreasing of bearing capacity of the oil seal. The range of continuous operating temperature range for the urethane or rubber oil seaB Is suggested to be-lO'CasTae
3.    Working pressure
There is a minimum service pressure request for the sealing element. It's better to choose seals with Iw friction property and small starting resistance when working under low pressure envfronmfrnv PU semi is not suitable for working below 2.5 Mpa; while under high pressure the deformation of seals has to be considered, so that we have to use back-up ring against extrusion whilst there Is also a special request for groove machining,
In addition, the best working pressure for seals made from different materials are also different. All in all, the best working pressure scope for PU seal Isl.S^Sl.SMPa.

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4.    Operating media
Besides following the advice recommended by manufacturer to choose the operating media, it is also very i m po rta nt to kee p th e operating media eJean. The aging ar pollution cf the oil could not only cause some elements of the system to bre^k tiown, but alsc» speed up aging and damage of sidling system. Moreover, the dirty stuff caused by aging or poFlution would even scratch th^ seal and cause sealing failure. Furthermore? the residual air In the all will be heated after high-pressured compression In the cylinder and make the seal ring burned, even carbonized. As a result( in order to avoid this kind of situation occurrence, exhaust processing must be carried out during hydraulic system Initial movement. Also, hydraulic cylinder should run slowly for a few minutes under low-pressure environment, to confirm there is no air left In the oil, then start normal working.
5.    Lateral load
Normally a back-up ring should be installed on the piston so that oil cylinder can accept higher load. The back-up rmg plays completely different role from ^airing. The back-up ring cannot be replaced by the ring. Especially in the hydraulic cylinder with lateral force, backup-rtng with strong bearing capacity must be used (use metal ring when necessary}. Otherwise there will be seepage and attrition when oil seal works under mis>allgnment ccndhion.

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6.    Hydraulic shock
Hydraulic shock could be caused by many ways. such as a bucket of excavator suddenly collide with a stone or the moment of a crane hoists up or lays down a heavy item. Besides those extrinsic factors, for
3 high pressure big-capacity hydraulic system, commutation of the functional element (like hydraulic cylindcror hydraulic motor and so on) will also easily cause hydraulic pressure if the change valve doesn't perform well, The hydraulic shock could cause an instantaneous high pressure which could be possibly several times more than normal working pressure. Such a high pressure can laniate the seal ring In extremely short time or extrude parts of seal ring into the gap. causing a terrible damage. Generally to prevent cylinder from hydraulic shock, it is recommended to install buffer ring and back-up ring on the rod. Buffer ring could absorb most shock strike while back-up ring prevents seal ring from being extruded into gap and making the root part damaged.
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