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Thread: Bezzera BZ10 3w solenoid valve sticking

  1. #1
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    Bezzera BZ10 3w solenoid valve sticking

    Gene Cafe Coffee Roaster $850 - Free Beans Free Freight
    Hello folks;

    Just recently hit a snag with my machine;

    Seems like the 3w solenoid valve is somewhat sticking,

    On brew, it leaks a little on the drain port,
    and when you turn the pump off, the valve doesn't open until about 3.5 bars then it pops.

    What do you think is going on?

    Backflushed with water after every shot; caffeto weekly (small amounts).
    Filtered water only. (have to say.... i suspect there might be bits of carbon granules from the filter cartridge, but not sure if it's actually enough to block anything)
    Guessing its a N/O valve, so could be a dirty seat.....
    Possible i need to look under the shower screen as well?

    Any ideas what's happening?
    Will probably pop the machine open once it's cooled down later

  2. #2
    Mal Dimal's Avatar
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    G'day mate...

    It's most likely down to some coffee detritus and/or oxidised coffee oils gumming up the solenoid armature. Should be able to disassemble it, soak in a hot solution of Cafetto then clean up.

    If it turns out that the above is the issue, maybe you need to use a little more Cafetto in your backflush routine...

    Mal.

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    Quote Originally Posted by Dimal View Post
    G'day mate...

    It's most likely down to some coffee detritus and/or oxidised coffee oils gumming up the solenoid armature. Should be able to disassemble it, soak in a hot solution of Cafetto then clean up.

    If it turns out that the above is the issue, maybe you need to use a little more Cafetto in your backflush routine...

    Mal.
    I'll give that a go =D
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  4. #4
    Senior Member Jackster's Avatar
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    I had a sticky one.. it was scored in the plunger barrel. Wasn't much I could do, but fixed with a replacement
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  5. #5
    Mal Dimal's Avatar
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    Hopefully it's not completely u/s...

    Mal.
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  6. #6
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    Had a soak, didn't work,

    Think the seal has failed (seems common on OLAB SVs), seems to be something to do with the armature stem being too long or the spring tension pushing too hard against the seal face/seal leaving a score there...
    OLAB also mentions that it does not recommend installing the valve with the solenoid facing down... (which it is...)

    i'll probably open it up again later, this time opening the armature chamber (didn't realise its o-ring sealed, don't have the right setup to open a sealant sealed thread); if the seal is scored well....
    time to replace haha 6 months old only though.
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  7. #7
    Mal Dimal's Avatar
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    Bugger...

    Hopefully it is only a seal that's bitten the dust as it's an easy fix...

    Mal.

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    Quote Originally Posted by Jackster View Post
    I had a sticky one.. it was scored in the plunger barrel. Wasn't much I could do, but fixed with a replacement
    Did you replace the valve, plunger assembly or just the seal?

  9. #9
    Senior Member Jackster's Avatar
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    Replaced it all, except the solenoid coil. Not a problem since.

    I tried cleaning it, no good...



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