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Silvia - Air bubbles in intake pipe??

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  • Silvia - Air bubbles in intake pipe??

    Hi all,
    Ive got a problem with my Silvia. Ive noticed that when I have my Machine on for more than 10-15 mins I get bubbles running up the water intake pipe and collecting at the most raised point. This causes the pump to struggle every time i try to pull a shot as it has to get the air out.

    My understanding is that the air bubbles are supposed to run out the other pipe. Ive pulled the machine apart and found that the two pipes connect at a three way brass valve just next to the boiler. Does anyone know much about the way these valves work? Is it possible to clean them?