Air-Operated Filter Press: Setting Hydraulic Relief Pressure

We are frequently asked how to set and check hydraulic relief pressure on an air-operated filter press. The following post includes tools needed, a breakdown of the important hydraulic components, necessary filter press information, and an instructional video. In the video you will learn how to set your relief valve pressure and your working pump pressure.

Inside the hydraulic cabinet: To set the relief pressure, you will only need to adjust the relief valve and the pump regulator.

Tools needed

  • Allen wrench (T-handle, if you have it)
  • Small wrench

Hydraulic components

  • Pump regulator: Controls the pump pressure
  • Relief valve: Controls relief pressure

Necessary filter press information

  • Relief pressure
  • Hydraulic clamping pressure

This information can be found in your IOM Manual. If you have an M.W. Watermark filter press, you can also find this info on the label in the hydraulic cabinet. It is important to note that the process for setting the relief valve pressures is the same no matter what size the filter press is, but the pressures are not. Both your relief pressure and hydraulic clamping pressure vary depending on what size filter press you have. It is critical that you check this information prior to beginning this process.

Label inside hydraulic cabinet

Video: Setting Hydraulic Relief Pressure on an Air-Operated Filter Press

YouTube video

Video transcript

Today we want to set the relief valve on an air-operated filter press hydraulic system. You want to remove the cap and loosen the jam nut. This is a new, unproven part so we want to start at 0 psi. We have the filter press closed right now with no pressure on it.

Back the relief valve out, back the pump regulator off so that it has no pressure potential. Turn the pump on to build hydraulic pressure.

Turn the relief valve clockwise to gradually increase pressure.

Right now we’re relieving at about 15-1600 psi so we just proved the relief valve works at a low pressure. The pump is still running; it’s dumping pressure over the relief.

We can gradually increase the relief valve pressure, now the pump is slowing down so we’ll increase the pump pressure a little bit. Now we’re relieving at 2200 psi, we can increase the pressure. Pump stalled out so we need to give it some more pressure on the regulator.

Now we’re relieving at 3000. We’re just proving that it’s working in a safe manner all the way up. This particular press relieves at 4900 so we want to gradually work our way up to 4900.

Right there we’re at our 4900 psi. Lock the locknut down, double check our setting, setting looks good, then we’ll back off our pump regulator to make the pump stall out. Then we’ll bleed some pressure off; and then restart the pump.

We want to set the pump to the filter press working pressure. This is a 630 mm Watermark press so this one, this one working pressure is 4500 psi.

We have the pump stalling at 4500 gauge pressure. Lock the regulator down and we’re good to run the press. (Don’t forget to put the cap back on the relief valve!)

Please let us know if you have any questions by leaving a comment (we check them everyday) or by contacting us.

About M.W. Watermark

M.W. WATERMARK wants to make a difference. We are passionate about the world’s water. We are innovative, focused on customer service and always try to exceed expectations. We are an environmentally conscious company with people who are energized, encouraged and inspired to make a difference on our planet by helping to keep our shared, finite water supply clean and usable for generations to come. We build amazing, custom water and wastewater treatment equipment. Together, we can make a difference.

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Air-Operated Filter Press: Setting Hydraulic Relief Pressure