Re: Regulating pump pressure


With all due respect and given the fact that I am not an electrician
or an electrical engineer, significantly lower or higher voltage
supplied to appliances with somewhat specific voltage and amperage
requirements have a high failure ratio when neither of those
requirements are met. If nothing else, it shortens their lifetimes
darstically.As an ersthwile KOA manager overseeing more than 120 sites
spread over 500 acres, I have seen some pretty freaky electrical
occurances. In one night, we destroyed over a dozen TV's and several
more refrigerators by delivering less than 90 volts to their trailers.
We also knocked a couple of senior citizens on thier ass by reversing
polarity at their hookup box. Damn it, when you grab the handle of
your airstream to open the door, you are not expected to jump
backwards into your neighbor's Coleman two-room tent.
On a more serious note, I have seen some serious damage done to
$20,000 espresso machines by sever voltage fluctuations, both high and
low. You can blame the Backstreet boys for one of these, but I don't
think it would be the most major of their infractions.
Inexperienced tampering with voltage and amperage is ill-advised. If
you do it don't call me.....al
On Thu, 12 Jan 2006 14:20:13 -0600, jim schulman
<jim_schulman@xxxxxxxxxxxxx> wrote:

>On Thu, 12 Jan 2006 19:31:45 GMT, "Mark P." <someone@xxxxxxxxxxxxx>
>wrote:
>
>>"Randy G." <frcn@xxxxxxxxxxxxxxxxxx> wrote in message
>>news:2j9ds1p5lghhibqa7dgv3oep368tj9qjfe@xxxxxxxxxx
>>>I was think about whether it would be possible to regulate pump
>>> pressure during the brewing processby regulating the electricity going
>>> to the pump? If a full-wave power control was used that supplied the
>>> full 60 cycles to it, but regulated the voltage to lessen the water
>>> pressure it supplied, or vice versa...? Just a thought from an art
>>> major....
>>
>>Here's what Jim Schulman has to say on the subject:
>>
>>http://www.coffeegeek.com/forums/espresso/machines/46475
>>
>
>That's the valve mod -- Greg's posted how to do ths on the Silvia
>
>I also connected a small variac to the pump (if you can do a PID, you
>can do this -- any old 1 amp + variac from ebay will do the trick. It
>does work, and one can imitate lever profiles (e.g. drop the pressure
>smoothly during the shot just by turning down the dial). This is a
>cheap mod, but to use it, you would need to add a pump pressure guage.
>There's a caveat - the vibe pump will not "brown out" below about 5 to
>6 bar; at that point it doesn't move water. And the usual caveat --
>voids all warranties ever made anywhere, anytime; not responsible for
>direct or incidental damage, caused or uncaused.

.

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