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question about pump pressure on Quickmill Anita
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cracker74
Senior Member


Joined: 16 Oct 2007
Posts: 37
Location: PA
Expertise: I like coffee

Espresso: Quickmill Anita
Grinder: MACAP M4, Baratza Virtuoso
Vac Pot: Yama 8 cupper
Drip: Capresso MT500
Roaster: Behmor
Posted Fri Jan 10, 2014, 4:59am
Subject: question about pump pressure on Quickmill Anita
 

I recently replaced the pump on my Anita as it failed after 6 years of use.  Everything seems to be working fine.  But I've been reading some threads about pump pressure when pulling a shot (9.0-9.5) versus when the boiler is being filled (~3).  I am getting a bit paranoid because after I finish pulliung a shot the pump pressure stays at about 9.  It will drop back down when flushing the group head to clean it but if not it stays at 9 or so.  Is it normal to stay at 9ish when a shot is done or should it drop back down to a lower number?  When it is at a lower number and I open up the hot water valve, the pump goes on eventually and the pressure rises to about 3.5 or so.  I guess that means I don't have a problem with the solenoid valve?  Any comments?  Thanks.
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calblacksmith
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calblacksmith
Joined: 25 Nov 2007
Posts: 8,038
Location: Riverside, Ca, U.S.A.
Expertise: I live coffee

Espresso: ECM Vene. A1, La Cimbali M32
Grinder: Azkoyen Capriccio, Major
Vac Pot: 40s era Silex
Drip: Msl. Com. brewers
Roaster: gave it a try, decided no
Posted Fri Jan 10, 2014, 8:27am
Subject: Re: question about pump pressure on Quickmill Anita
 

No it is not normal for the pressure to remain at brew levels with the pump off.
The gauge is normally located in the brew path, most often between the boiler and the group head. There is a separate gauge mounted on the boiler for static pressure to indicate the temp of the boiler. Normal reading here is in the range of 1.3 or so depending on how your machine is setup.

On a SBDU, there is only a brew gauge if any, it can be located anyplace as the pump should be plumbed in before the boiler so that it sees only cold water, this means that the whole system after the pump is brought to brew pressure when brewing.
Often, there is a check valve between the boiler and the brew group to prevent back flow to the boiler from the brew group after the shot, this can be the 3way valve which shunts the pressure to the drip tray or the pressure can bleed off through the spent puck on lower cost machines.there is also a check valve between the boiler and the pump to prevent back flow there.

I suppose that if the gauge was mounted between the two check valves on the boiler, it could show brew pressure if the valve between the boiler and the brew group did not allow the pressure to bleed off as it should, returning the  system to  low pressure after the shot.

It is still early so I may not thinking clearly but no the system should not remain pressurized after brewing.

 
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Anything I post is personal opinion and is only worth as much as anyone else's personal opinion. YMMV!

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topull
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Joined: 10 Jan 2014
Posts: 8
Location: Toronto, Canada
Expertise: Just starting

Posted Fri Jan 10, 2014, 9:32am
Subject: Re: question about pump pressure on Quickmill Anita
 

I just picked up a Quick Mill Silvano and find the same thing... hopefully this is not a concern....?!
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Frost
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Frost
Joined: 26 Jul 2007
Posts: 2,116
Location: Sierra
Expertise: I love coffee

Espresso: Isomac Venus
Grinder: Lelit PL53
Roaster: Poppery I w/variac, MET, BT
Posted Fri Jan 10, 2014, 9:38am
Subject: Re: question about pump pressure on Quickmill Anita
 

The 3-way valve isolates the boiler or Hx from pressure relief, (only the group dumps to the tray) and there is a check valve in the pump; so it is normal for there to be residual pressure you are seeing.  ....unless there is a leak somewhere in the circuit.
Likely your old pump had a small leak in the check valve that bled off the residual pressure.
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Giampiero
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Joined: 29 May 2013
Posts: 59
Location: Bangkok
Expertise: I love coffee

Espresso: Quick Mill Vetrano
Grinder: Fiorenzato F5
Posted Fri Jan 10, 2014, 10:44pm
Subject: Re: question about pump pressure on Quickmill Anita
 

topull Said:

I just picked up a Quick Mill Silvano and find the same thing... hopefully this is not a concern....?!

Posted January 10, 2014 link

it's normal, don't worry.
Once your pump developed the brewing pressure, this pressure is even inside the boiler ( Silvano it's not an HX machine), once you stop the pump, the 3 way valve ( it's a solenoid valve ) discharge the pressure only from the head group, but the brewing pressure, settled by the OPV, will still inside the boiler and the brewing pressure gauge will read it, ( it's connected just after the pump)  until you will not "reopen" the water circuit for the next shot.
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topull
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Joined: 10 Jan 2014
Posts: 8
Location: Toronto, Canada
Expertise: Just starting

Posted Sat Jan 11, 2014, 3:40pm
Subject: Re: question about pump pressure on Quickmill Anita
 

Thanks for the clarification.. much appreciated!  Is it ok if the pressure is not released right away?  I try to 'clear' it because I figure the pressure sitting in there for long periods would put undue stress on the components(?)

Thanks again!  

:)



Giampiero Said:

it's normal, don't worry.
Once your pump developed the brewing pressure, this pressure is even inside the boiler ( Silvano it's not an HX machine), once you stop the pump, the 3 way valve ( it's a solenoid valve ) discharge the pressure only from the head group, but the brewing pressure, settled by the OPV, will still inside the boiler and the brewing pressure gauge will read it, ( it's connected just after the pump)  until you will not "reopen" the water circuit for the next shot.

Posted January 10, 2014 link

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cracker74
Senior Member


Joined: 16 Oct 2007
Posts: 37
Location: PA
Expertise: I like coffee

Espresso: Quickmill Anita
Grinder: MACAP M4, Baratza Virtuoso
Vac Pot: Yama 8 cupper
Drip: Capresso MT500
Roaster: Behmor
Posted Mon Jan 13, 2014, 5:27am
Subject: Re: question about pump pressure on Quickmill Anita
 

I confirmed with Chris Coffee where I purchased my machine that this is completely normal.
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