Shower valve elbows and flow rate

[Serval]

Im planning on how to fit a concealed shower valve into a paramount wall which has a narrow cavity depth(35mm)

Luckily the rear face of the wall is in the hw cylinder cupboard so i plan to have part of the valve coming through to the cupboard then boxing it in.

If i do this the position of the inlet and out let valves will be partly blocked by the plasterboard board so i was thinking could use a couple of 90 degree elbows separated by short section of pipe in a sort of z shape to clear the obstruction

The question ive got is will using multiple bends un close range have a big impact on the flow rate?

Its a gravity fed system so I'll be using a shower pump (not specced and bought yet)

 

[ShaunCorbs]

Why not use an exposed valve ?

 

[Serval]

Why not use an exposed valve ?

The Mrs

 

[ShaunCorbs]

Depending on what your planning why not remove the plaster board and cardboard and install some 3x2 or 4x2 and glue to the existing plasterboard ?

 

[Ben-gee]

I recently fitted an ibox in a paramount wall (80mm minimum depth).
I cut away a section of the plasterboard so I could turn the elbows to 45 degrees and pulled a bend in 22mm copper to suit this- this is less restrictive than your suggestion.
However if you use a suitable pump, what you propose will be fine.

 

[Serval]

Thanks both. Should be doable if i cut out some of the plasterboard. Will look into that and maybe a bend in the pipes to see if i can make it work

 

[Ben-gee]

I cut away plasterboard and then fitted a plywood plate on the cupboard side of the wall to strengthen it and give me something to screw the valve to.
It was a bit fiddly but worked well, just put a removable box to protect the valve, but left pipework exposed so any potential problems would show themselves in the future- not all hidden away, and it gave easy access for some full bore lever valves.

 

[Timmy D]

If you have to make an offset, bending is best or use 45’s over 90’s.