Today I notice one of my growbed (Basil Growbed) the valve fails to cut off water. This valve was running without any issue for the pass six months or so, ever since I assemble it to this growbed.
The plant growth around it is a lot and took some fiddling to get to it. I have never clean this valve from the initial installation. I did not want to change or adjust anything yet to see whether a simple maintenance will resolve the problem.
I proceed in removing the cover and bell and do the cleaning of this valve with a bottle brush and put the bell and cover back in position.
I waited for the flushing and what more important is the cut-off, as expected it cut-off without any more problem.
The cleaning did rectify the problem of no cut-off and probably this is the only action needed to be done when ever failure of water cut-off occur.