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Upgraditis hit: VBM Super Leva

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  • #16
    Re: Upgraditis hit: VBM Super Leva

    I think Brett has it.
    My understanding is that the half-stop allows the basic pressure of the system to begin the pre-infusion. If it is not plumbed in, there is no basic pressure, so that position opens a valve but nothing happens on a tank machine.
    The built-in pre-infusion run by the pump is the essence of the E-61 design according to the patent.
    Greg

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    • #17
      Re: Upgraditis hit: VBM Super Leva

      The middle point: I can only comment on the tank version. Only used for backflushing, which Renzo starts by putting the teaspoon of chemical into the blind filter filled with water to the rim, inserting the portafilter into the group head, opening the valve to the middle position, and the chemical reaction causes a slooow ooze back up the open pipe and a slooow drip out of the base of the valve near the drip tray.

      After a little while (allowing the chemical to dissolve the oils in the pipes), its followed up by eight true backflushes with the lever in the on position, held for a fast count to five, then off for a couple of seconds. On, then off etc. Then followed by one double-shot brew, which is tossed, of course.

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      • #18
        Re: Upgraditis hit: VBM Super Leva

        Did my first "suds additive" backflush today.

        The amount of $hit that ended up in the drip tray was extraordinary.

        Oh, and middle position be damned!

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