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how to recharge a unvented expansion vessel?

I have a unvented boiler and the water is flowing through tuntish, I was told that it can be easily sorted by recharge the expansion vessel
shan, January 2012
If your vessel is the charged type that lost pressure can be done with bicycle pump if bladder inside did not tear. Need to drop boiler pressure to 0 and temp.cool to add the air.

old guy, January 2012