Diaphragm press filter, a pressure filter with an elastic membrane added between the filter plate and filter cloth. During operation, upon completion of the feed, a high-pressure fluid or gas medium can be injected into the diaphragm plate, at which point the entire diaphragm will bulge and compress the filter cake, thereby achieving further dewatering of the filter cake—the process commonly referred to as squeezing filtration.
Diaphragm press filters are known for their high pressing pressure, excellent performance, easy maintenance, and safety, making them a preferred choice for clients in industries such as metallurgy, coal gas, papermaking, coking, food, brewing, and fine chemicals.
Diaphragm filter presses have been widely applied in various fields requiring solid-liquid separation. Diaphragm filter presses are considered as the alternative and upgraded equipment for the conventional box filter presses. They demonstrate excellent performance in terms of processing capacity per unit area, reducing the moisture content of the filter cake, and adapting to the properties of the treated materials.
Diaphragm filter presses differ from standard box filter presses primarily by adding two elastic membranes (composite rubber diaphragms) on both sides of the filter plates. During operation, once the feeding is complete, high-pressure fluid medium can be injected into the diaphragm plate. At this point, the entire diaphragm will bulge, pressing the filter cake to achieve further dewatering of the filter cake, which is a squeezing filtration process.
Diaphragm press filters are used in sludge and wastewater treatment. The moisture content of the filter cake has been reduced to below 30%. Compared to traditional box press filters, the solid content of the filter cake can be increased by more than twice, significantly reducing the transportation costs of the filter cake. The filter cake can be directly burned at power plants, truly transforming sludge into a resource and wastewater into clear water, effectively replacing box press filters.

Diaphragm Classification
For different diaphragm materials, the new generation of membrane press filter machines can be categorized into rubber diaphragm type and polymer elastomer diaphragm type.
The rubber diaphragm filter press is ideal for filtering materials that are weakly acidic, weakly alkaline, and not organic solvents. The rubber diaphragm filter press improves upon the past's缺点 of the separate fixed-body design, which wasted energy after feeding. The new design ensures that the rubber diaphragm is fully inflated, and the pressure and gas volume used are_加充分.
Automatic Diaphragm Press Filter - Reinforced PP Model is smaller, and under the same gas source volume, the rubber diaphragm drum is three times the thickness of the high polymer diaphragm drum, which can significantly reduce energy consumption.
High molecular elasticity diaphragm pressure filter is used for materials such as strong acids, alkalis, and organic solvents, offering ideal performance and a long service life. Its pressing forms include gas (air) pressing and liquid (water) pressing, catering to the needs of various industries. The pressing components can be configured in standard and ordinary grades, with control systems available using PLC and human-machine interface. For general materials, the diaphragm membrane can perform pressing and dewatering after 3-15 minutes. For some special materials, a staged pressing method of low-pressure pressing followed by high-pressure pressing can also be adopted.
Diaphragm filter presses achieve a dehydration filtration process and enhance the filtration effect of the press, significantly reducing the moisture content of the filter cake. After the feeding process is completed, the machine's dehydration efficiency is improved by squeezing the filter cake, increasing the dryness of the cake, reducing pollution, and even reducing labor requirements, and in some processes, the drying step can be omitted.