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Oil or grease seals are essential devices used to protect the shafts and bearings from the accumulation of dirt. They don’t let the lubricant escape; that is, it does not allow any leakage in the rotating shaft. They close the gap between the moving and the stationary parts so that the machine parts are adequately greased and oiled. These seals also take note that the two fluids inside the machine are not mixed. Thus the oil or grease seals are used to separate fluids or lubricants. These seals are primarily used in rotatory applications.
The oil seals are installed next to the bearing with a flexible lip against the rotating shaft. The casing is deepened in the housing so that the seal is held in its position. The lip of the sealing must be kept lubricated at all times so that it is not overheated. The oil seals are made up of different compounds of materials. It is imperative to identify the quality you are buying as the seal should be appropriate for your machinery. As long the seal matches the equipment, the machine will serve you in the best possible way. So the importance of the oil seals must not be overlooked, and we should go for buying the correct oil seal for our equipment. The poor installation and the selection of the oil seals can lead to leakages and a lot of internal pressure, leading to overheating. So we need to be cautious while making a third purchase. Here are few factors which we can consider before buying the oil seals:
Temperatures: It is the most crucial factor when we go for purchasing an oil seal. The temperature must be optimal not to let the lip of the sealing overheat. If the temperature is going above the range, the lip of the sealing may be cracked. The temperature range of the equipment in which the seal is installed must not exceed that of the seal elastomer.
Pressure: It is very important to detect the pressure beforehand and then buy the seal. Some seals are designed to bear only minimal pressure. The conventional seals must not be used in the devices where the pressure is going to exceed as the seal will break. We must shift to the high-pressure seals in case there is internal pressure.
Concentricity: The sealing lip will be destroyed if the bore and the shaft are not in alignment. In this way, there will be more wear and tear as the shaft and the bore will have many gaps. Also, the misalignment can shorten the lifespan of the oil seal.
Runout: Run out refers to any inaccuracy in the mechanical parts. The shaft does not rotate in line with the central axis and leads to problems. Thus the runout must be kept at a very low level. The problem is doubled when it is coupled with misalignment of the shaft and the bore.
Lubricants: Seals are known to perform better when they are properly lubricated and possess the correct viscosity. Also, it must be compatible with the material of the elastomer.
Wear and tear: This factor is applicable in almost all our buying decisions. Wear and tear is that part that cannot be avoided. Every machine is subjected to a considerable amount of wear and tear. This the oil or grease seals must be purchased considering the wear the tear of the device.
Firmness of shaft: The hardness of the shaft is an essential factor in predicting the life of the oil seals. The harder the shaft, the longer the life of the oil seal. As the seals are exposed to a lot of dust and contamination, the shaft must be hard enough to sustain the seals for longer.