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Are anti-vac valves supposed to leak?

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  • Are anti-vac valves supposed to leak?

    I used a San Marino earlier this year that had a quiet leak from the anti-vac valve and noticed my Faema does the same thing. This leak is from the valve itself (the bit that sticks up when pressure builds), not from between the valve and the boiler. Is this normal or is there a wearing part that can be replaced? The only parts on coffeeparts http://www.coffeeparts.com/misc/antivac.html appear to be the copper washer which I presume goes around the outside of the body.

    Greg

  • #2
    Re: Are anti-vac valves supposed to leak?

    It should only leak when youve turned the machine off and it is cooling down and when you first turn the machine on.

    There is an internal washer/o-ring on many of the valves Ive seen that is replaceable. On some machines replacement of the entire valve is the only option once they start to leak. Im sure Pedro at Coffee Parts could tell you exactly what youll need for your machine if its one of the rebuildable ones.

    As a temp fix you can try tapping the post that sticks up out of the valve which will release a spurt of steam (Careful!) and cause the valve to pop close under pressure which can then get it to seal completely. Try tapping it several times waiting to see if it seals after each one. Dont mistake the condensed water on the valve boiling off for a leak. If it hasnt sealed after a handful of tries it probably wont.


    Java "About to rebuild his" phile
    Toys! I must have new toys!!!

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    • #3
      Re: Are anti-vac valves supposed to leak?

      Thanks Java (where you been?). My machines apart at the moment but Ill give that a check when its all back together and running.

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      • #4
        Re: Are anti-vac valves supposed to leak?

        Mine occasionally doesnt close completely (maybe once a month). I tap it with a chopstick through a hole in the top, and it resettles. But i would never call it a leak, just a very slight hiss of steam. But just be very careful when you do this, as a lot of steam does come out straight at you.

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        • #5
          Re: Are anti-vac valves supposed to leak?

          Others have already answered but there is always another perspective.

          The short answer is:

          Yes it is "supposed" to leak even if only when the machine is pressurising up from a cold start, or cooling down when switched off.

          In practice the anti vacuum valve is a very imprecise instrument and can give a lot of "trouble" for whatever reason. I dont wish to write a one page essay on the reasons why here hehehe, I did say "short answer".

          They do wear out and when they do, or if you cant stop them doing something they oughtnt.....you just replace them as its not worth the time and effort to frig around with them at ninety nine dollars an hour labour rates attempting to see if you can effect a suitable "fix" that might last only another day.

          Cheers,
          attilio.

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          • #6
            Re: Are anti-vac valves supposed to leak?

            Originally posted by Greg Pullman link=1226636581/0#2 date=1226642004
            Thanks Java (where you been?). My machines apart at the moment but Ill give that a check when its all back together and running.
            Ive been around, usually for relatively short periods as I took a nasty fall here 2 weeks ago and busted up my ribs on the right side. So I havent been spending tons of time crouched over my keyboard as usual. Just enough to log on and check the threads and answer any questions that havent already been addressed by someone else.


            Java "Slowly healing" phile
            Toys! I must have new toys!!!

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            • #7
              Re: Are anti-vac valves supposed to leak?

              Get well soon JP!

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              • #8
                Re: Are anti-vac valves supposed to leak?

                Ditto.

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                • #9
                  Re: Are anti-vac valves supposed to leak?

                  my machine keeps hissing. and sometimes the pump will run for a few second....it sounds like its the anti vac valve...should it hiss every 30 seconds or so ?



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                  • #10
                    Re: Are anti-vac valves supposed to leak?

                    no shouldnt hiss every 30 or so. Only a few mins after startup for a few seconds. Maybe as your element switches on, and the pressure builds that little more you are getting a leak?

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                    • #11
                      Re: Are anti-vac valves supposed to leak?

                      no leak..it just keeps hissing..its new only a week or so old..it never did it to start with,,so perhaps I need to take it in for repair?

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