Hi I have a water hammer problem and have been advised to install a pressure reducing valve at source, but would I get the same effect by simply turning down the main stop tap ? I have tried this but to eliminate the hammer but the pressure drops to a unusable condition, Is the PRV just a measurable device for turning down the pressure or am I missing something ? my point is, what is the difference between installing a PRV and simply turning down the main stop tap ? Thanks Richard
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