Safety installations Systems technology Container technology Heating and drinking water systems Solar technology Storage technology             Silos from 50 - 5.000 m³ Silo discharge devices Safety installations    Explosion valves    Technical data    Positive/negative    pressure valves Pneumatic conveying and dispensing devices Accessories Introduction More information is available at the download page   Positive/negative pressure valves Weighted pressure safety device for all bulk solids silos. The response pressure is determined by the valve weight and is therefore not adjustable. The positive / negative pressure valve comes in nominal widths of DN 200, DN 300 and DN 800. For special applications, an ATEX-certified design can be selected.