https://wiki.diyfaq.org.uk/api.php?action=feedcontributions&user=219.138.204.162&feedformat=atomDIYWiki - User contributions [en]2024-03-28T17:55:08ZUser contributionsMediaWiki 1.35.9https://wiki.diyfaq.org.uk/index.php?title=Fitting_TRVs_to_Microbore&diff=5001Fitting TRVs to Microbore2007-09-20T20:13:47Z<p>219.138.204.162: </p>
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multifunzione] [http://modelos-top.nodify.info/ modelos top] [http://giochi-java.jaily.info/ giochi java] This article is about fitting [[Thermostatic Radiator Valves]] to [[microbore]] pipe used in [[Central Heating]] systems. It is equally applicable to fitting manual valves and lockshield valves when reworking or extending an existing microbore system.<br />
<br />
The approach described here uses a standard 15mm valve and a soldered 15mm*8mm or 15mm*10mm fitting reducer (e.g. [http://www.bes.ltd.uk BES] 6786 or 6787) to connect to the microbore. This avoids the difficulties that are likely to occur trying to fit a new 8mm or 10mm valve to existing pipework: because microbore copper is very soft the pipe is often found to be distorted when the old valve's olive is removed making it very difficult to get a good seal to the new valve. Even if the pipe is not distorted it is very easy to over-tighten microbore compression joints resulting in leaks. Because this method uses soldered joints the heating system must be drained down to below the level of the valves being replaced.<br />
<br />
'''TIP:''' If planning to replace several valves on an existing system check the diameter of pipe on '''''all''''' valves to be changed: often systems have a mixture of 8mm and 10mm pipework.<br />
<br />
{| style="width:100%" cellpadding="8"<br />
| [[image:TRV_microbore_01.jpg|center]]<br />
Insert a fitting reducer into the valve so that the olive sits in the middle of the reducer (see pictures of the soldered-up connector, below) and tighten so that the olive grips the reducer.<br />
<br />
| [[image:TRV_microbore_02.jpg|center]]<br />
Line up the TRV body with the existing valve body and mark the microbore for cutting to fit into the reducer.<br />
<br />
| [[image:TRV_microbore_03.jpg|center]]<br />
Cut the microbore where marked: in this instance a junior hacksaw is used as there isn't space to use a wheel-type cutter<br />
|}<br />
<br />
{| style="width:100%" cellpadding="8"<br />
<br />
| [[image:TRV_microbore_04.jpg|right]]<br />
| [[image:TRV_microbore_05.jpg|left]]<br />
|-<br />
| colspan=2 align="center" | Unscrew the old valve body and tail from the radiator (this saves undoing the valve from the tail and then using an L-shaped hex key to unscrew the tail).<br />
|}<br />
<br />
{| style="width:100%" cellpadding="8"<br />
<br />
| [[image:TRV_microbore_06.jpg|center]]<br />
| [[image:TRV_microbore_07.jpg|center]]<br />
| [[image:TRV_microbore_08.jpg|center]]<br />
|-<br />
| colspan=3 align="center" | Clean out the tapping in the radiator. A wet</div>219.138.204.162