Side Entry Ball Valves (2 of 2)

[solutions]

Yes sadly the jobsworth is right cant use a part 1 just use an adjustable arm part 2 from williams its what I use on syphon cisterns.
This is it.

 

[Old Account]

Any chancd sombody could explain me why we are not allowed to use a brass float arm ? What is a dcv ?

 

[ShaunCorbs]

Yes sadly the jobsworth is right cant use a part 1 just use an adjustable arm part 2 from williams its what I use on syphon cisterns.
This is it.

the problem is if i have to change them they would need to have an extended arm as most of them are plastic cisterns

and also is it right you cant use type 3 with the plastic bag tube either sol???????????

 

[solutions]

Any chancd sombody could explain me why we are not allowed to use a brass float arm ? What is a dcv ?

Dcv is a back flow prevention device.
Double check valve.
You can use brass float arms but they have to be part 2 tyoe and not part 1 as part 2 can not cause back syphoning as the water outlet from the valve set us at the top typically from a pkastic arm where as part 1 the water exits tge valve from a hole on the bottom that could come in to contact with the stored water in the custern and resukt in back syohoning and contamination of a mains water supply.

 

[Old Account]

Is that generally not use those with the plastic bag or just in your case ?

 

[solutions]

the problem is if i have to change them they would need to have an extended arm as most of them are plastic cisterns

and also is it right you cant use type 3 with the plastic bag tube either sol???????????

Yes also correct as they can and do back syphon.
Why the extended arm? Are the cisterns a special shape or size?

 

[Old Account]

Thanks first of all,

Basically I will need to install wherever I go the extended arm version to prevent back flow and also too installing a double check valve ?

 

[jaydebruyne]

Page 7.4 of the latest regs book

 

[jaydebruyne]

Dcv is a back flow prevention device.
Double check valve.
You can use brass float arms but they have to be part 2 tyoe and not part 1 as part 2 can not cause back syphoning as the water outlet from the valve set us at the top typically from a pkastic arm where as part 1 the water exits tge valve from a hole on the bottom that could come in to contact with the stored water in the custern and resukt in back syohoning and contamination of a mains water supply.

Another reason for having to use part 2 is often you have to bend the brass arm in order to set the water level correctly and this, as far as regs go, is not acceptable as it weakens the arm which could become brittle and break...

 

[ShaunCorbs]

Page 7.4 of the latest regs book

whats the difference other than the looks if they both conform to bs1212