• bleeding and venting valve EB 1.84 - bleeding and venting of dirty pit water in open-cast mines

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Bleeding and venting valve EB 1.84
Bleeding and venting of dirty pit water in open-cast mines

In the German brown coal open-cast mining sites, the mixture of sand and coal is removed above-ground by means of a special excavator technology. The ground water must be collected in wells and subsequently disposed of, in order to enable the huge excavators to work trouble-free without getting sunk in the mud. High-performance submersible motor pumps lift the water which then flows through so-called drainers to the pit water cleaning plants. Most of the drainers are arranged above-ground and constitute a pressure pipe system.

EB 1.84

To protect the pipelines, combined startup and continuous bleeding and venting valves should be installed on high and low points. When you think of big water pipelines having a diameter of more than 20 inch. (1,000 mm), you mostly imagine sturdy steel pipes or pipes made of concrete or ceramics. However, those pipes are difficult to move, and for a number of years now they have been replaced by more lightweight plastic pipes. This provides cost advantages and has some practical reasons. Plastic pipes have the advantage that they are not corroded by the pit water, which contains ochre with different pH values. Therefore, the valves also have to be protected against wear and tear. Thanks to its basic material stainless steel 1.4404 (316L), the bleeding/venting valve EB 1.84 resists such corrosion without any problems. With the float arranged at the bottom of the valve, the valve mechanism is protected against contamination by the ochre sludge. In spite of all this, the EB 1.84 design is very compact and low. This is essential because the outside installation requires the valve to be fully functional also during long frost periods. With a low overall height of the valve, the wind load (moment) is reduced. Plastic pipes difficultly take load and compensate it.

In addition, the EB 1.84 is an excellent protection from undesirable negative pressures within the system thanks to its enormously high ventilation efficiency. Although plastic pipes are very lightweight, cost-effective and easy to handle, they need to be protected from implosion by means of an effective vacuum protection.

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