One of the most difficult media to extract in the mining industry is abrasive sludge. It usually contains toxic chemicals that pose a great danger to humans and the environment. Its function is similar to sandpaper and it can move at high speed. These sludge are transported through various process steps and finally stored in wet storage pits or open ponds. Therefore, the valves used here must be absolutely leak proof even under extreme conditions. Bidirectional uninterrupted, long service life. This is because maintenance only takes place at longer intervals. We are willing to accept challenges and very satisfied.