Filter Presses

Diefenbach Filter Presses consist of two fixed heads – including a feeding side and a drive side, an overhead beam or two side beams, and a moving head containing a pack of vertical rectangular or squared plates with recesses on each side. The fixed head serves as an end to which the feed and filtrate pipes are connected. The moving head moves along the beam and presses the plates together during the filtration cycle by a hydraulic or mechanical mechanism.

Each filter plate is covered with a filter cloth on both sides. When the plates are pressed together, the recessed areas form a series of chambers – the number of which depends on the number of plates in the press. The plates feature a centrally located feed port and two to four filtrate ports running along the length of the entire filter press so that all the chambers of the plate pack are connected together.

The slurry is fed to both ends of the filter press using a pump. As the chambers between the plates fill with the slurry, the solids in the slurry are trapped on the filter cloths, allowing the free flow of the liquid through the cloth to be discharged via the filtrate ports in the corners of the plates. The liquid is then directed toward storage tanks through outlet flanges located in the fixed head of the filter press.

At the end of the filtration stage, the mechanism opens the cylinder slightly to allow dripping. The mechanism then opens the cylinder completely to release the dewatered solid cakes. 

Diefenbach offers a variety of plate opening systems that are chosen based on the application. These include manual opening, standard opening, fast opening, instantaneous opening and instantaneous pack opening.