Mira Excel built in shower valve, room for inlet pipes

[DaveyH]

Hi,

I'm in the process of fitting our Mira Excel Built in shower valve.

I've chased our plaster/brick wall in accordance with the installation instructions, ie 58mm deep, 145mm high, 245mm wide, here is a picture (I haven't chased the outlet pipe yet, which will be going upwards)

Haven't chased outlet yet

• DaveyH
• 28 Jun 2014
• 1

Here is a picture of the valve in the hole.

valve in the hole

• DaveyH
• 29 Jun 2014
• 1

I've also made a couple of mock-up 90° elbows for the inlet pipes. However, I can only insert the pipes into with the valve while the valve is outside of the hole. If I put the valve into the hole first, there simply isn't enough room on either side to insert the pipes. Is this normal?

shower valve in hole

• DaveyH
• 28 Jun 2014
• 1

As I see it, I've got 3 options

1. Hope I never need to remove the entire valve for maintenance or replacement at some point in the future.
2. Widen the hole about an extra 7mm on each side.
3. Use a 90° street elbow with an olive fitting on it, so that my 90° bends are much tighter, like one ones shown in Mira's installation instructions, here is their picture.

miras very tight 90° bends

• DaveyH
• 28 Jun 2014
• 1

Miras very tight 90° bends

However putting olives on street elbows seems to be frowned upon by many on here (see //www.diynot.com/forums/viewtopic.php?t=132554&start=0).

So what would you do?

Thanks in advance.

 

[Jackrae]

The rear body of the valve stays in position if the valve ever needs servicing. You remove the inards only via the four screws on the front of the body. So, assemble the pipework then fix the lot into the recess confident that it'll never have to come out (fingers crossed)

 

[Norcon]

Might be a good idea to apply some Laco slic tite.
Which is good to go on liquid pressures of 680 bar.

Especially if your not pressure testing.
I think access to the compression nuts is fairly restricted after the building shroud is removed as far as I can remember. Though a slim line spanner might access them.

You need balanced pressures for this valve also as cross flows can occur. The combination valve on the unvented cylinder will have an extra port for this purpose.

 

[slapper]

Also wrap some protection tape around your pipes to prevent corrosion

 

[DaveyH]

Thanks for all of the replies.

Might be a good idea to apply some Laco slic tite.
Which is good to go on liquid pressures of 680 bar.

Never heard of this stuff before, does it go on the compression nut threads or olives or both?

You need balanced pressures for this valve also as cross flows can occur. The combination valve on the unvented cylinder will have an extra port for this purpose.

Not sure if this applies to us. As our boiler is a combi boiler. So hot and cold will (in theory) have the same pressure and there isn't cylinder.

Thanks