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BY type plate and frame filter press is a pressure filter equipment with gaps, which is widely used in the solid-liquid separation of various suspensions in the chemical, metallurgical, pharmaceutical, food, dye and other industries. The machine is divided into two types: manual type and automatic type. The automatic type has the functions of automatically pressing and opening the plate and frame, and the filter chamber is equipped with a pressing diaphragm, which reduces the moisture content of the filter cake by about 10% compared with the filter cake without the pressing diaphragm.