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Tommy Walsh's DIY Guide
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Tommy Walsh's DIY Guide (2001)(Empire).iso
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t5k.txt
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1998-10-05
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Summary
These topics contain basic information about the types of
fitting available in modern supply pipes:
1 Pipe connection method
2 Fitting an isolating valve
3 Fitting a one-way check valve
Tools
As per chosen method.
Materials
Isolating valve, double check valve
Step 1 - Pipe connection method
There are various ways of connecting pipes which donÆt
have to be exclusively used. A Compression joint is simple
to use but it is more expensive.
Step 2 - Fitting an isolating valve
When fitting a new appliance or fixture you must fit an
isolating valve somewhere in the pipework, preferably near
the fixture. This then allows only that appliance to be
very quickly isolated in the event of a fault. This fits
in a similar way to a compression fitting.
Step 3 - Fitting a one-way check valve
If there is a possibility of back siphonage, such as when
a shower is fitted, you must fit a double check valve.
This prevents water flowing in the opposite direction into
the system and must also be fitted to a new outside tap.
An outside tap, however, now comes with a double check valve
built in. Check with the manufacturerÆs instructions to
confirm this.