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The safety conditions of the underground works carried out for the coal mining process are ensured by longwall supports. The particularities of the system of hydraulic powered roof supports are given by structure of the supporting component, by the pumping station and respectively by the operating liquid and the length of the wall the activity of which needs to be ensured. The pumping stations used for the supply of the roof supports, also called hydraulic assemblies, are composed of: the oil in water tank, the pu...