What to do if the Plate and Frame of the Filter Press Leaks

During the long-term operation of the filter press, water leakage and water seepage between the plates and frames are common problems. Especially in sewage treatment, mine tailings, chemical industry, food processing and other industries, filter presses need to run for a long time and at high frequency, and the filter plates, filter cloths and hydraulic systems will all produce a certain degree of wear. In order to ensure the efficient and stable operation of the filtration system, this article has compiled for you the common causes and professional treatment methods of water leakage in the plate and frame of the filter press.

Common Causes of Water Leakage in Filter Press Plates and Frames

1. Insufficient pressure in the hydraulic system

The pressure of the hydraulic system is too low and the filter plates cannot maintain sufficient pressing force. When the filter pressure increases, the slurry may overflow from between the sealing surfaces of the filter plates.

2. The filter cloth is wrinkled or not installed properly

As a filter medium, if the filter cloth is unevenly installed, wrinkled, folded or misaligned, it will affect the sealing effect between the filter plates.

3. The filter cloth is damaged or has holes

After long-term use, the filter cloth may be washed away by material particles and cause wear, damage or holes. In addition to causing water leakage in the plate and frame, it may also cause the filtrate to be turbid and solid particles to enter the filtrate.

4. Foreign matter adheres to the sealing surface of the filter plate

If filter cake, mud or other solid particles remain on the sealing surface of the filter plate, it will also cause the filter plate to fail to fit completely, resulting in water leakage.

5. Grooves are washed out at the corners of the filter plate

After many years of use of the filter plate, grooves may gradually form in the corner sealing areas under the long-term effects of high-pressure filtration and material erosion. Once groove marks occur, they will rapidly deepen and widen under high-pressure feeding, causing the sealing performance of the filter plate to decline. When the slurry leaks from the trench, it will not only cause water leakage in the plate and frame, but may also cause the local moisture content of the filter cake to increase, the filter cake to become soft, and in severe cases, it may even fail to form normally.

How to Deal With Water Leakage from the Plate and Frame of the Filter Press

1. Insufficient pressure in the hydraulic system

Check the working status of the hydraulic station, hydraulic oil and cylinder, and confirm whether the actual pressing pressure meets the equipment requirements. For automatic filter presses, it is also necessary to check whether the pressure control of the hydraulic system is normal.

2. The filter cloth is wrinkled or not installed properly

Rearrange and install filter cloth. If the filter cloth has been severely deformed or aged, it is recommended to replace it with a new filter press cloth in time.

3. The filter cloth is damaged or has holes

Regularly check the integrity of the filter cloth and replace it promptly if any damage is found.

4. Foreign matter adheres to the sealing surface of the filter plate

After filtration is completed, promptly check and clean foreign matter on the sealing surface and grooves of the filter plate. If necessary, rinse with high-pressure water.

5. Grooves are washed out at the corners of the filter plate

For slight sealing groove marks, oil surface repair agent can be used to repair them according to the filter plate material and actual working conditions to restore the sealing surface to a certain level of flatness, thereby improving the sealing effect between the filter plates. However, if the filter plate has been severely worn, deformed or damaged, it is recommended to replace the filter plate directly.

How to Reduce the Leakage Problem of Filter Press

In order to reduce the incidence of water leakage in the plate and frame of the filter press, it is recommended to establish a regular inspection system during daily use. Clean the sealing surface of the filter plate in time after each cake unloading, check the wear of the filter cloth regularly, and pay attention to whether the pressure of the hydraulic system is stable. In addition, the filter press maintenance cycle should be reasonably formulated based on the nature of the materials to be processed, the filtration pressure and the frequency of equipment use.

In general, water leakage from the plate and frame of the filter press does not necessarily mean a serious failure of the equipment. By checking the hydraulic pressure, filter cloth condition, filter plate sealing surface, and filter plate wear, most water leakage problems can be quickly located and dealt with. For long-term operation of the filter press, routine maintenance of the filter cloth, filter plate and hydraulic system is an important measure to ensure the filtration efficiency of the filter press, the filter cake forming effect and the service life of the machine.