Valves in action -
Pressure reducing valve DM 620
Water supply to a hard coal mine

 The excavation gear strips the coal at the coal face by slicing or cutting it from the face and then transports it onward. The enormous amount of carbon dust released through this technology causes serious harm to the health of the miners and, in the event of an explosion, the fire wave would expand to several kilometers. 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, fire fighting systems, air conditioning plants and to other consumers 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 DM 621 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 from CrNiMo steel.

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