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Water pressure for plumbing
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Sylvain
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Joined: 19 Dec 2001
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Espresso: La Marzocco GS3
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Posted Fri May 17, 2013, 11:35am
Subject: Water pressure for plumbing
 

I have bought a filters kit and water regulator from Chriscoffee but dont know exactly the recommanded pressure to plumb in the GS3 AV.  Anyone can help ?  Thanks a lot.  Sylvain
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DavecUK
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Posted Fri May 17, 2013, 1:19pm
Subject: Re: Water pressure for plumbing
 

It would be the same for any rotary pump machine...........around 2 - 2.5 bar, it's plenty to stop the pump cavitating and not too much to prevent the balanced bypass from doing it's job.

There is of course a fundamental difference between pressure and flow (which people often misunderstand), but assuming the fittings your using are of standard fittings you will be fine at those pressures. In fact the smallest bore fitting will probably be the one that came with you machine to connect to the mains supply, or the tubing inside the machine leading to the pump, and they are always OK at 2-2.5 bar.

e.g.  To illustrate the difference between pressure and flow with an extreme example. 0.1mm internal diameter tube can have a pressure of 3 bar, but the flow rate will be low and not supply a pump properly, even at 9 bar it probably wont.. Whereas a 0.5mm tube (or larger) at 2 bar will have much more flow and be fine.
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qualin
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qualin
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Posted Sat May 18, 2013, 12:37am
Subject: Re: Water pressure for plumbing
 

Related to this topic I guess,

After I plumbed in, My Duetto reads 3.5 bar sitting idle. I don't have a pressure regulator installed whatsoever.

I'm hearing two different points of view.. one vendor is telling me I don't need one, another does.

So, what's the deal with this?

 
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DavecUK
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Joined: 21 Sep 2005
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Posted Sat May 18, 2013, 2:13am
Subject: Re: Water pressure for plumbing
 

qualin Said:

I'm hearing two different points of view.. one vendor is telling me I don't need one, another does.
?

Posted May 18, 2013 link

It will work without one, but I think at your pressure I would be wanting to fit a pressure regulator...Ultimately though, I personally don't like these machines being plumbed in. I prefer to use them tanked, don't like the thought of a leak. They really don't need filling very often, admittedly, I put a larger 3l internal tank into my Duetto, because the stock tank is a bit small.
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frcn
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frcn
Joined: 23 Dec 2001
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Posted Sat May 18, 2013, 5:20am
Subject: Re: Water pressure for plumbing
 

DavecUK Said:

...Ultimately though, I personally don't like these machines being plumbed in. I prefer to use them tanked, don't like the thought of a leak.

Posted May 18, 2013 link

It is an easy matter to use an inline, low-voltage, solenoid operated valve in the water line so that the line is pressurized only when there is a demand from the machine for water. It cold be placed at the supply end to be on only when the machine is on as well. There are also leak detectors that can turn the water off when a leak is detected.

 
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DavecUK
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Joined: 21 Sep 2005
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Location: UK
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Posted Sat May 18, 2013, 9:55am
Subject: Re: Water pressure for plumbing
 

frcn Said:

It is an easy matter to use an inline, low-voltage, solenoid operated valve in the water line so that the line is pressurized only when there is a demand from the machine for water. It cold be placed at the supply end to be on only when the machine is on as well. There are also leak detectors that can turn the water off when a leak is detected.

Posted May 18, 2013 link

Yes, strangely enough I had managed to work out these potential solutions, comes from designing these things I suppose ;-)
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Sylvain
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Joined: 19 Dec 2001
Posts: 72
Location: Trois-Rivieres
Expertise: I love coffee

Espresso: La Marzocco GS3
Grinder: Mahlkonig K30 Vario
Drip: Technivorm
Posted Sun May 19, 2013, 6:04am
Subject: Re: Water pressure for plumbing
 

Many Thanks for the usefull answer.  Sylvain
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Sylvain
Senior Member


Joined: 19 Dec 2001
Posts: 72
Location: Trois-Rivieres
Expertise: I love coffee

Espresso: La Marzocco GS3
Grinder: Mahlkonig K30 Vario
Drip: Technivorm
Posted Sun May 19, 2013, 6:13am
Subject: Re: Water pressure for plumbing
 

Hello Randy.  I have bought the same water plumbing setup as you speak of in ypur website from Chriscoffee.

I really like it.  Thanks for sharing.  Sylvain
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