This article is about fitting Thermostatic Radiator Valves to microbore pipe used in Central Heating systems. It is equally applicable to fitting manual valves e.g. a lockshield valve when reworking or extending an existing microbore system.
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Insert a fitting reducer into the valve so that the olive sits in the middle of the reducer and tighten so that the olive grips the reducer.
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Line the TRV body up with the existing valve body and mark the microbore for cutting to fit into the reducer.
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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 and using an L-shaped hex key to undo the tail)
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| Clean out the tapping in the radiator. A wet & dry vac can be used to suck out debris or the radiator can be taken off and flushed out.
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| Prepare the microbore pipe tail for soldering checking that it is clean all the way round.
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Solder to the fitting reducer (making sure the valve nut is over the pipe first!).
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Check that solder can bee seen all around the joint.
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| Use preferred thread-sealing method and fit valve tail to radiator.
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| Tighten valve nuts (supporting valve against twisting).
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Fit thermostatic head.
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