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The Department of Public Works in a large city in southwestern Germany has part of the necessary ground water pumped from artesian wells. This type of well may only be used in areas that are lower than the surrounding ground, for example valley basins. The location of an artesian well also requires an impermeable stratum above the rock layer that contains the ground water. The artesian well is drilled into the basin below the ground water table. The replenishing ground water from the hillsides generates a hydrostatic pressure onto the valley-sided ground water. Hence the water rises through the well shaft without requiring further auxiliary tools. Consequently, only the pressure from the banked-up water will be used for conveying the ground water upwards.
Pumps will then be employed to extract the water. Switching the pumps on and off for water withdrawal will entail changes in the liquid level of the well shaft. The Mankenberg EB 3.51 is used here as a bleeding and venting valve and simultaneously as overflow protection. Owing to its large seat cross section, the EB 3.51 discharges and feeds big air quantities at low closing pressures. The valve closes leak-free only by means of the float buoyancy force. The seat has proven to be tight also at very low pressures. The special thing about this valve is that is closes tight also without any internal system pressure within the pipework.
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