SV are installed to control the flow of water through a straight pipe and as a shut off valve to isolate the supply. M & S are able to provide a tracing and mapping service and advise where valves should be installed.
M & S are usually able to repair defective valves without the need to replace them, which is more cost effective. This involves ‘re-packing’ the valve to re seal it. Re-packing is completed with or without excavating, depending on how much room is around the valve.
When it is not possible to repair a valve then M & S can replace it. This will normally require excavation but M & S will undertake this with minimal disruption.