Harry Bloomfield Wrote in message:
on 26/03/2018, harry supposed :
They have a little float in them. If air appears, it falls ans opens a valve
in the top.

You can dismantle and clean any crud out and clean the valve seat and
needle. (They can stick a bit or get something on the valve seat.)

I have come across another type, where a material gets wet, causing it
to swell and thus acts as a valve.


+1
--
Jim K


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