Difference between revisions of "Fitting TRVs to Microbore"
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It is equally applicable to fitting manual valves and lockshield valves when reworking or extending an existing microbore system. |
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. | 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. | ||
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The approach described here uses a standard 15mm valve and a soldered 15mm*8mm or 15mm*10mm fitting reducer (e.g. 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.
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.
 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. |
 Line up the TRV body with the existing valve body and mark the microbore for cutting to fit into the reducer. |
 Cut the microbore where marked: in this instance a junior hacksaw is used as there isn't space to use a wheel-type cutter |
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| 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). | |
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| Clean out the tapping in the radiator. A wet | ||