Changing cistern inlet valve

[Catkin]

The inlet valve in the toilet cistern is quite noisy so I would like to change it for a fluidmaster. I have replaced an inlet valve before, only took about 10 minutes and was very easy but I was simply changing like for like so didn't have to change any pipework. This time I will be removing a Derwent Macdee DVA0300 and replacing with a Fluidmaster bottom entry brass shank valve.

Is anyone able to advise me whether the threaded bottom end on inlet valves is a standard length, I am trying to determine whether the 2 valves can be swapped straight over without having to change any of the existing pipework.

Advise appreciated.

 

[Billy Bob Bob]

yes they are a standard length

 

[Catkin]

yes they are a standard length

Thank you

 

[Catkin]

In an attempt to quieten down the Macdee valve I inserted a spiral flow reducer into the inlet of the valve which improved things a bit and stopped the big 'thump' when the valve cut off but I am hoping the Fluidmaster will be even quieter.

Should I still use a flow reducer with the Fluidmaster?

 

[PlumbBobBob]

the fluidmaster will come with one, just fit it as per instructions you will be fine.

 

[Catkin]

Thank you

 

[WaterTight]

the length isn't always exactly standard in my experience but only varies but a couple of mm so unless you have absolutely no play whatsoever in pipework it shouldn't be an issue. i took out and old looking weird one out of a loo once and had to cut some of the thread off below cistern to get it out as it was catching on syphon. then i found it had a longer thread than any other valve i had and was connected to an elbow coming straight out of a tiled wall which was as rigid as a cliff face.