📹 How to Resolve High or Low Brew Pressure on the Quick Mill Vetrano Design

Brew Pressure is Too High/Low

If you think the brew pressure in your Quick Mill Vetrano Design is too high or too low, you can test by inserting the backflush disc into the portafilter, locking it in, and running the pump. 

Coffee has too many variables to determine if the pressure issue is strictly caused by your machine and the backflush disk gives us a control model to use while testing. With the backflush disk in, the gauge should rise to 9 bars in 9-11 seconds. If it doesn’t, you may need to open the machine to adjust the OPV to the correct pressure. 

Note: Although the machine featured in the video below is the Profitec Pro 700, the Vetrano Design is similar enough that the process described will work for both machines.


How To Adjust Brew Pressure

Brew Pressure is High

Do you have the backflush disk in?

  • This is the only true test of brew pressure. Coffee has too many variables. The backflush disk gives us a control model. With a rotary pump, and the backflush disk in, the gauge should rise to 9 bars in 4-6 seconds.
    • What is the brew pressure with the backflush disk in? Is it over 9 bars?
      • What is your water line pressure at?
        • It should be about 35 PSI or lower. If your water pressure is really high in your house, like around 60 PSI, this is going to cause a lot of extra pressure on the pump, and will affect the pressure at the group head.
      • Try adjusting your OPV. The OPV may be too open and needs to be adjusted down. The OPV and the pump need to be adjusted together. For example, if the pump pressure is 8½ and OPV is open at 9 bar, the OPV will need to be adjusted to open at 11 bar, which will cause the rotary pump pressure to raise more to 9 bar. Adjust OPV to 11 bar, then adjust pump pressure to 8½ bar. If these adjustments are not made together it will cause flow issues while brewing.

Brew Pressure is Low

Do you have the backflush disk in?

  • This is the only true test of brew pressure. Coffee has too many variables. The backflush disk gives us a control model. With a rotary pump, and the backflush disk in, the gauge should rise to 9 bars in 4-6 seconds.
    • Your brew pressure is truly low, and has been measured with the backflush disk in:
      • What is your water line pressure? This should be around 35 PSI. If it is too low, see if it can be turned up.
      • Adjust your brew pressure.

Are you getting constant water flow out of the OPV/discharge tube?

  • The OPV may be too open and needs to be adjusted down. The OPV and the pump need to be adjusted together. For example, if the pump pressure is 8½ and OPV is open at 9 bar, the OPV will need to be adjusted to open at 11 bar, which will cause the rotary pump pressure to raise more to 9 bar. Adjust OPV to 11 bar, then adjust pump pressure to 8½ bar. If these adjustments are not made together it will cause flow issues while brewing. 
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