Mechanical seals rubber O-ring failure performance

??Mechanical seal with secondary seal, in order to use more synthetic rubber O-rings. Mechanical seal failure in about 30% because of the O-ring failure caused. The failure performance is as follows:

??1. aging. High temperatures and chemical corrosion is usually the main cause of rubber hardening cracks. Rubber aging, the performance of the rubber hardens, strength and elasticity, there will be severe cracking, resulting in the loss of sealing performance.rubber product

??Rubber in the storage vault, the long-term exposure in the sunlight, or contact with ozone, or storage time is too long, aging occurs; overheating causes the rubber components decompose, even carbonized. In the high temperature fluid, vulcanized rubber ring is dangerous to continue, and ultimately lose elasticity and leak. It is necessary to understand each of the safe use of a synthetic rubber temperature.

??2. The permanent deformation. Permanent deformation of the rubber seal is often more serious than other materials. For example, the use of rubber O-ring into a square ring for a long time at a high temperature into, will become the same as the shape of the trench, when the temperature is kept constant, it can also play a role in sealing; but the temperature decreases, the seal circle will soon shrink, and leak leak path is formed. Therefore, we should pay attention to the use of various types of plastic temperature limits, should avoid prolonged use in extreme temperatures. If you can not change the seal operating conditions are to be improved from the structure, in order to mitigate the adverse effects of temperature on rubber materials. For example, it is possible to use a larger cross section of the rubber O-ring; O-ring to stay away from vice Friction; an appropriate increase in the hardness of the O-ring; with trench assembly structure (do not push squeeze ring structure, without rendering spring force is applied to the O-ring), and so on.

??3. swelling deformation. Synthetic rubber expansion will occur in some media, sticky or dissolution phenomena. Therefore, according to the nature of the working medium, use the chart to select suitable material information.