New Ball-cock fitted now noise

Gerry T

I fitted a new ball-cock (brass) and float (plastic) to the mains water tank (plastic), but since there has been a lot of noise around the house, presume this is what they call water hammer. Never had this before--past 10 yrs. The mains pipe connecting to the tank is qualplex not copper.

I didn't bend the arm of the new ball-cock, its fitted low enough, a good bit below the overflow so wasn't worried but does the bend help in closing the valve ?

To fix this I was thinking of taking the arm from the old ball-cock which is longer, new one is about 8" and old one about 16" long, the though is this may help to close the valve against the mains pressure. And would a copper float be better than the plastic ?

Alternatively I could close off on the mains valve coming into the house, but I'm not mad about doing this.

Any advise here before I start doing things that are really a waste of time ?

corkgsxr

Fit a fluid master side entry toilet ballcock.

Always solved it for me if there's very high pressure

Gerry T

Thanks, but are you allowed to fit a toilet ball-cock to the mains tank.

Doolittle51

The same thing happened to me when I changed my ball cock. Tank feed is qulapex too, but was never supported or attached or insulated.

It's been fine since I insulated and attached it properly.

Gerry T

Doolittle51 wrote: »

The same thing happened to me when I changed my ball cock. Tank feed is qulapex too, but was never supported or attached or insulated.

It's been fine since I insulated and attached it properly.

Thanks I must look at how the mains pipe is fixed/supported. Just I'm a big guy and you would need to be an acrobat to get to where the tank is in the attic.

corkgsxr

Gerry T wrote: »

Thanks, but are you allowed to fit a toilet ball-cock to the mains tank.

There a high pressure ballcock why wouldn't you be allowed

Gerry T

corkgsxr wrote: »

There a high pressure ballcock why wouldn't you be allowed

I'm not a plumber so don't know the full regs etc... but it's just something in the back of my head said a toilet ball cock wasn't to be used on the main tank. I could be totally wrong though.

corkgsxr

Gerry T wrote: »

I'm not a plumber so don't know the full regs etc... but it's just something in the back of my head said a toilet ball cock wasn't to be used on the main tank. I could be totally wrong though.

AFAIK it's to do with back siphonage but the fluidmaster ones are anti siphon

Gerry T

corkgsxr wrote: »

AFAIK it's to do with back siphonage but the fluidmaster ones are anti siphon

Thanks