Leaked oil from hydraulic systems that are used in the health sector, food and manufactured foods and unani medicines. In order to avoid this, research in recent years was accelerated, and the water came to be used as the hydraulic fluid. Of water be a natural and inexpensive material, to avoid damage to the environment when thrown, food and drugs has such advantages as to prevent hazard in the case of the virus. However, the manufacture of parts that are used in aqueous hydraulic systems, oil systems, more power and therefore more expensive. The viscosity of the water, the oil is less. This also augments the effects of infiltration and erosion. The water also can cause corrosion in the material, although easily freeze because the freezing point is high, there are disadvantages, such as creating a favorable environment for the development of microorganisms. The Elimination of these negative aspects of intensive R & D activities are being carried out in the future, it is considered to use more water as the hydraulic fluid.
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