Shower mixer valve inlet centres (what does +-5mm mean)

[Adam78]

Hi,

I've come across a few thermostatic shower mixer valves where the technical spec states the inlet centres are 150mm (+- 5mm). What does the +-5mm mean, if on the valve body the distance of the inlet holes are fixed at 150mm.

Does it mean that the inlet centres on the wall can be between 145-155mm and for example if the inlet centres on the wall were spaced at 145mm the valve body will still fit?

 

[joni os]

The + or - 5mm is the manufacturer's tolerance, they can supply between 145 - 155 c/c and you have to fit to what you get.

 

[Adam78]

The + or - 5mm is the manufacturer's tolerance, they can supply between 145 - 155 c/c and you have to fit to what you get.

Have a look at this one - Bristan Zing. It states dimensions for Fitting: 135-165mm adjustable inlet centres.

If the nut on the valve body is fixed at a certain distance, how would it fit to an inlet centre within the above 135-165mm range. I'm i missing something? Surley the nut and inlet need to have the same distance between their centres for a snug fit?

 

[joni os]

Behind the cover plates the fitting has two cranked arms

 

[SimonG]

Or the elbows wind in and out. Depends on style of shower valve.

 

[Adam78]

Behind the cover plates the fitting has two cranked arms

Do you mean the valve body has a cover plate behind which their are two cranked arms?

 

[kris]

Your usually safe with 150mm centres unless it's a small Mira etc @ 120mm centres

 

[AlexGas]

That would be adjustable centres, this side of a tile.