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What type of isolating valve should I use for a power shower. I notice that the bore seems very small on standard (screwdriver operated ones) but the lever type sold as gate valves seem to have full bore. Will the flow be resticted by the screwdriver operated one?

We moved house a couple of months ago and in the last few days have noticed that the inlet on my header/expansion tank runs continuously. It doesn't overflow but just seem to keep trickling into the central heating system (in fact the water level never gets anywhere near the overflow). As soon...