CWSC overflow dripping

[Dan1706]

Any help here would be appreciated. My overflow pipe from the CWSC in the loft is dripping. It is not a constant drip. I have regualry been checking the level in the loft but is never at the level of the overflow pipe. I am confused as to how this is happening.

Is there any other reasons for why a drip can occur?

Thanks

 

[ShaunCorbs]

How old is the ball valve ?

 

[Dan1706]

How old is the ball valve ?

I would say very old. The cistern is the open type with just insulation covering the top.

 

[ShaunCorbs]

I would change that as a first port of call could be that dripping at night when the mains water pressure is at the most

 

[Dan1706]

I would change that as a first port of call could be that dripping at night when the mains water pressure is at the most

Ok, thanks for that. I will do that first and see what happens.

 

[rpm]

Is there a 22mm copper pipe that comes up, over and drops back down towards the tank?