membrane filter press

Working principle of diaphragm filter press:

1. Open flow non washable models: Ports A, B, C, and D are sealed, without a washing system. When filtering the feed, valve l opens, 

and the pressure regulating valve regulates the flow and pressure; The spout emits liquid. When pressing, valve 1 is closed, valve 3 is 

opened, and compressed air is introduced into port F for air blowing diaphragm pressing. After the squeezing is completed, open 

the air release valve to discharge the compressed air.

2. Open flow washable models: Ports C and D are sealed, and during feed filtration, valve L opens. The pressure regulating valve 

adjusts the flow and pressure, and the water nozzle opens to discharge liquid; When pressing, valve 1 is closed, valve 3 is opened, 

and compressed air is introduced into port F for air blowing diaphragm pressing. After the pressing is completed, open the reflux 

valve to discharge the pressing water. When washing, valve 1 is closed and the water nozzle on the washing plate is closed. Open 

valves 2, 4, and 5, and feed washing water into ports A and B.

3. Undercurrent non washable models: Ports A and B are sealed tightly, and when there is no water outlet or feed, valve l opens and

valves 6 and 7 discharge liquid. When pressing, valve l is closed, valve 3 is opened, and compressed air is introduced into port F for 

air blowing diaphragm pressing. After the pressing is completed, open the reflux valve to discharge the pressing water.

4. Undercurrent washable model: No water nozzle for liquid discharge. When filtering the feed, close valves 4 and 5, open valve 1 for

 feed, and open valves 6 and 7 for liquid discharge. When pressing, valve l is closed, valve 3 is opened, and compressed air is 

introduced into port F for air blowing diaphragm pressing. After the pressing is completed, open the reflux valve to discharge the 

pressing water. To cross wash, first open valves 2, 4, and 7, and close valves 1, 5, and 6. The washing water enters the washing plate

 from ports A and C and is discharged from ports B and D. Then close valves 1, 4, and 7, and open valves 2, 5, and 6. The washing 

water enters the washing plate from ports B and D and is discharged from ports A and C.

Characteristics of diaphragm filter press:

1. The concentration of solids in the filter cake is relatively high.

2. It can adjust the filtering characteristics and solid concentration in the suspended liquid during changes.

3. Compared to logistics capacity, it requires less space.

4. The washing of filter cake can achieve better results.

Precautions for diaphragm filter press:

1. The washing system and backwash system can be selected according to the user's process conditions;

2. Each valve should be installed as close as possible to the thrust plate and minimize bends;

3. The pressing medium can be water, oil, air, etc.

Schematic diagram of diaphragm filter press: