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Quick Mill Anita pump issue? idk...
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Discussions > Espresso > Espresso Mods > Quick Mill Anita...  
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Senior Member

Joined: 17 Jun 2011
Posts: 45
Location: Garland, TX
Expertise: I love coffee

Espresso: Quick Mill Anita
Grinder: Baratza Virtuoso Preciso
Posted Sat Feb 8, 2014, 7:53am
Subject: Quick Mill Anita pump issue? idk...

Hey guys...

Need a bit of help determining what my issue is here. I have an older style Anita that I just replaced the teflon seat and o-rings in the steam arm, and the expansion valve seat. It was running fine for a couple days then all the sudden I started seeing a pressure drop while pulling a shot. I have taken it all apart again and actually taken the expansion valve completely off and thoroughly cleaned it. I soaked it in citric acid and got it all nice and shiny. :D and I still have the same issue. I thought it may be sticking or something, but that isn't it apparently. Here's what's happening:

As I pull the shot, the pressure comes up to well over 10 bar (yeah I know not good) for a second, pump goes really quiet (like I've never heard it go that quiet before), then starts continually dropping as the shot pulls. I have noticed the last few times IF the heater kicks on the pressure REALLY drops... to like 4 or so. All the time the shot continues to go...

When I have the backflush disc in, it doesn't seem to drop. Now all this really tells me is that the system is maintaining that holding pressure. Chris' Coffee service dept says if it maintains pressure with the backflush disc in, then it's not the pump... somehow that doesn't really make sense to me. If no water can leave the system, then of course the pressure would remain constant regardless of what the pump is doing... all the pump would have to do is initially get it to pressure and the system itself would maintain that pressure until I drop the lever. Now my question along with that is, I've read somewhere with the blackflush disc in there is supposed to be water flowing back into the tank. I lift the hose and see water going back into the tank on the pressure rise, but once there then nada. Is this how it's supposed to be or no? I don't mind paying for a new pump IF that really is the problem, but I'd rather not waste the moolah if not.

and before anyone mentions beans. I've change up tamp/pressure/grind/etc and even different beans. no changes... I guess this is just like anything else, once you start fixing stuff more stuff decides to crap the bed...

as always, any and all help is greatly appreciated!

OH! and before I forget... is there a difference in an OPV and an expansion valve? I see the same part referred to with both names.

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Senior Member

Joined: 5 Sep 2013
Posts: 33
Location: Ireland
Expertise: I live coffee

Espresso: Quickmill Anita
Grinder: K30-es,La minerva c11, Hario...
Drip: v60, Aeropress
Posted Mon Jul 28, 2014, 1:32pm
Subject: Re: Quick Mill Anita pump issue? idk...


I have a Quickmill Anita also. I had this issue also and was worried about it. If it is in fact the same as my machine this is normal.
On my machine with correct grind etc shot reads at a steady 9-10 bar for about 14-17 seconds then slowly declines in pressure.
The shot is finished by the time it reaches 8bar more or less.

What I believe is happening is simply that as the shot continues more soluble solids are dissolving and inevitably pressure is declining with less resistance within the puck. I may be wrong of course, but this is what I believe is happening.
I have done many taste tests and I don't find it alters the taste of the shot in any negative way (I am starting to believe it has a positive impact on shot quality)

I am using a Mahlkonig k30-ES grinder and VST baskets.
I hope some of this helps.
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