Bleeder/Vacuum breaker/Anti-syphon valve can be found on the newer Isomac TEA and Millennium espresso machines as well as many Vibiemme heat exchanger and dual boiler espresso machines. The purpose of the valve is to relieve the boiler of a vacuum that is created in he boiler when it cools down.
This particular part is designed to connect to a return to reservoir hose or the drip tray hose. With this design, the small amount of water that exits upon machine warm-up is redirected instead of landing on the top of the boiler. For some, this is important, but in our opinion, the small amount of water that exits is very nominal and has been made without this water redirection for decades.
If there is a lot of water exited this valve upon start up with the pump constantly filling the boiler, the water being used for the espresso machine may be too pure (distilled, reverse osmosis, purified) and not have enough minerals to allow the water level senor to properly read the level of water in the boiler of the espresso machine. Limescale on the refill probe can also cause the same issue. Hence the machine overfills and the first leak is the bleeder valve.
Constant dripping or steam leaks on this part usually results from wear or limescale and should be replaced.
This part may be a suitable replacement for the following part numbers:
Ascaso F.1504 and F.3049
Visacrem 08178907 and 08179004
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