"TheOldFellow" wrote in message
...
On Tue, 28 Jun 2011 21:21:49 +0100
TheOldFellow wrote:

On Tue, 28 Jun 2011 20:04:34 +0100
"polly filler" wrote:


"TheOldFellow" wrote in message
...
On Tue, 28 Jun 2011 11:01:38 +0100
"polly filler" wrote:


"TheOldFellow" wrote in message
...
On Tue, 28 Jun 2011 09:48:36 +0100
Invisible Man wrote:

On 28/06/2011 08:08, TheOldFellow wrote:
I'm fitting a new bath. It has a Geberit bath filler, which
fills through the 'andle for the waste. As my system is
mains hot and cold, I am fitting check valves in both hot
and cold supplies - Water Regs, I think. The pipe is 22mm.

Now the check valves that I have are quite restricted in
diameter inside, looks about 12mm. Is this right? Seems to
me that this will restrict the flow something rotten. How
can I calculate flow rates for pipes of different bores, and
what corrections are needed for short restrictions like
this?

R.

Can you not fit full flow check valves?

Can you suggest where I can find them?

You won't need them, if it's this one you're using, Gerber113
Geberit bath filler
it needs to be tank fed



Nothing in the installation instructions about that, and it was
sold to me as suitable for a fully mains fed system. Can you
elucidate, or point to a definitive source? You have me worried
that I've been sold something unsuitable.

R.

ukbathrooms.com sell them, to comply with regs need to be tank fed
WWW.gerberit.co.uk



I'll check with my supplier. But thanks for the 'heads up' on this,
if it turns out to need a tank, they can have it back.

R.


Checked with Geberit UK, and they say there is no problem.

R.

Thats not what it says on their blurb, good look with it anyway