Nonrestrictive water valves

[MikeJM]

Hi
Can anyone tell me what is the difference between an ordinary inline isolation valve and a "nonrestricting" valve as detailed in the installation instructions for the Mira sport Electric shower i'm installing?
Grateful for any info.
Thanks
Mike

 

[namsag]

Could it be one is restricting to water flow and one isn`t

 

[ricicle]

Some 1/4 turn ball valves do not allow full flow when they are open as the ID is quite a bit smaller than the pipes ID.Look for a valve that has an ID, when open, on a par with the pipe it is in line with ie non - restricting

 

[corgiman]

NON restrictive

http://www.screwfix.com/app/sfd/cat/pro.jsp?cId=100121&ts=26131&id=13103

restrictive

http://www.screwfix.com/app/sfd/cat/pro.jsp?cId=100121&ts=26163&id=16505

 

[Nige F]

Looks like it`s down to the size of your lever