Pressing Onward: A Dewatering Blog

What Happens if Your Hydraulic Pressure is Out of Whack?

By Darrin Stewart


Hydraulic pressure is certainly not something to “play with." It should be respected in the same way you might respect electrical energy. If you are not comfortable with trouble shooting hydraulic issues, please contact the experts at Evoqua Water Technologies to assist you with any hydraulic issues you may have.


why is hydraulic pressure so important?

First and foremost, you need to understand the need for hydraulic pressure in a filter press. The hydraulic system is in place to combat the hydraulic force that comes from feeding a filter press with sludge. When sludge is fed into a filter press, it creates pressure on the plates of the filter press, and it is necessary to push the liquid through the press while capturing the solids.

Therefore, it is necessary to keep the press closed to allow the solids to form a “cake” and allow the liquids to pass through the press. Having the proper setting on the hydraulic closure system allows the press to remain closed while forming a cake of solids inside the filter press.


Your hydraulic pressure is too what?

If the hydraulic pressure falls below an acceptable level, the filter press might open and lose pressure not only in the hydraulic closure system, but also in the feeding of the product to the filter press. This often results in sludge leaking or spraying out of the filter press between the plates, making a terrible mess. Leaking sludge can result in a loss of productivity and perhaps product, depending on the application of the filter press.


On the flip side... what if your hydraulic pressure is too high?

If hydraulic pressure increases and over-pressurizes the system, the filter press is being pushed to its design limits and could be damaged. Increasing hydraulic pressure to combat a process issue is, in most cases, not advisable. Increased pressure equals increased force. Excessive force usually leads to mechanical failure. Your filter press is designed with certain pressures and forces in mind; deviation from them can result in increased wear and eventually system failure.

So as you can see, it is very important to keep an eye on the hydraulic pressure levels of your filter press.

Want to learn more about filter press maintenance? Download our FREE guide, FAQ's for Filter Press Process, Operations & Maintenance.


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