How to supply water in a hard coal mine?
A hard coal deposit, commonly known as seam, is often located several hundred meters underground. A narrow and long excavation chamber is driven into the underground along the seam to allow for the extraction of the coal.
The enormous amount of carbon represents serious harm. As a consequence, water-driven dust trapping and cooling systems reduce the formation of dust already at the source and prevent thermal overload of the highly stressed coal slicer.
The water supply to the excavation gear cooling system is fed above ground and covers a height difference of approx. 920 m. It can reach inlet pressures of up to 100 bar. The Mankenberg pressure reducing valve is installed upstream of the underground water supply network and reduces the inlet pressure from 60 - 110 bar down to the required system pressure of approx. 15 - 25 bar. The valve delivers high flow rates under high pressure. Its hard-faced seat and cone are ideally suited for the big pressure drop. Body and spring cap of the piston-operated, single-seated and balanced straight-way valve are made of steel, the medium-wetted internal parts are made of CrNiMo steel.
Get detailed information about Pressure Reducing Valves (PRV)...
Mankenberg High Pressure Valve for Medium and High Flow Rates DM 620 - 628
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