Abstract: A filter press for the filtration of suspensions has a frame, a support plate (1), a pressure plate (2) mounted in the frame and a set of vertically arranged filter plates (4) between the support plate (1) and the pressure plate (2). The filter plate (4) is provided with a single layer filter fabric (8) on the side that removes the liquid and collects the solids. The filter fabric runs over two filter cake removal rollers (6, 7) that are so positioned relative to each other and relative to the fabric (8) that an S-configuration is imposed on the filter fabric (8) as the rollers travel along the fabric. A pressure application device (5) presses the filter plates (4) together. A cleaning pipe (17) with spray nozzles (17A) for cleaning the filter fabric (8) is positioned between the cake removal rollers. The single layer fabric reduces the filtering resistance, thereby increasing the capacity of the filter press.

Abstract: In a filter plate-and-diaphragm assembly, the marginal sealing zone of the diaphragm has a sealing rib received in a groove of the filter plate frame. During operation, the diaphragm, with the exception of the sealing zone, is lifted off the filter plate by a pressure medium introduced in a pressure chamber bounded by the diaphragm. The rib is situated in the vicinity of that edge of the sealing zone that is remote from the pressure chamber, so that an intermediate sealing zone of considerable width is disposed between the rib and the pressure chamber.