Re: 3-way valve abomination

On 19 Oct 2005 13:46:32 -0700, michael@xxxxxxxxxxxxxxxxxxxxxx wrote:

> All Hydraulic machines are hybrid piston machines where the primary
> piston (large diameter) simply replaces the spring. All secondary
> seals in hydraulics share the same parts with lever machines.
>
> To liken hydraulics with modern pump driven machines would be
> problematic. Hydraulic machines in the US are quite rare, actually,
> and most manufacturers have dicontinued them. I think Rancilio still
> has one and you aren't supposed to install hydraulics in California
> because they are water hogs.
>
> While hydraulic and lever machines can and do get dirty, as you have
> illustrated, they cannot be easily cleaned by the operator daily and
> cannot be backflushed ever. Because the flow of espresso back into the
> system is not as great as with traditional modern machines, you can go
> longer between cleanings before they get gunked up.
>
> Because there is no standard daily cleaning possible for lever machines
> short of simply removing the screens, I guess I am not sure what proper
> cleaning you are referring to.
>
> Most of the posts on this board are from home users pulling 4 to 6
> shots per day. Back flushing everyday is not, in my opinion, necessary
> fro these users. Commercial users should process it once or twice a
> day.
>
> The only reason I suggested not returning the lever on E61 groups to it
> resting position is to replicate the effect of a two way valve; I
> wasn't suggesting that anyone was doing anything wrong.
>
> Also, any residual coffee that drips from the portafilter as a result
> of depressurization AFTER you stop the flow isn't what you want to
> drink. That's why you stopped it when you did.
>
> I wasn't aware that I had any 'mindset' that could be an issue here.
> Then, I wasn't aware that anyone serious about espresso machines
> thought that hydraulics were even viable anymore.
>
> Who knew?
>
> Michael

Michael and Al,

Are these hydraulic groups the ones I have seen on the Rancilio Z9 and
Cimbali Pitagora for example???

Paul
.

Relevant Pages

  • Re: 3-way valve abomination
    ... lever ... Indeed, all espresso machines are ... much more important on piston machines. ... >seals in hydraulics share the same parts with lever machines. ...
    (alt.coffee)
  • Re: Hydraulic lathes?
    ... I don't know if you could control hydraulics as precisely as ... Enerpac that control the balancing of bridge sections to keep them ... I don't think that a hydraulic system could retain anything approaching ... Notice that the cited examples (the mentioned tracer machines, ...
    (rec.crafts.metalworking)
  • Re: 3-way valve abomination
    ... All Hydraulic machines are hybrid piston machines where the primary ... seals in hydraulics share the same parts with lever machines. ... While hydraulic and lever machines can and do get dirty, ...
    (alt.coffee)
  • Re: Hydraulic lathes?
    ... I don't know if you could control hydraulics as precisely as ... I imagine that the big problem is in designing the ... Enerpac that control the balancing of bridge sections to keep them ... Notice that the cited examples (the mentioned tracer machines, ...
    (rec.crafts.metalworking)
  • Re: Hydraulic lathes?
    ... I don't know if you could control hydraulics as precisely as ... I imagine that the big problem is in designing the ... Enerpac that control the balancing of bridge sections to keep them ... Notice that the cited examples (the mentioned tracer machines, ...
    (rec.crafts.metalworking)
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