Pressure Reducing Valve/Water Hammer & other plumbing ad

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2 Feb 2011
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Hertfordshire
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United Kingdom
Hi all,
I’ve got a couple of issues with my plumbing which after taking up floorboards and securing pipes every 18inches (where possible) which leads me to believe I need either a water pressure reducing valve and or water arrestor to solve… the problems I have:

-Dishwasher (and to some extent the washing machine): causes water hammer across the entire cold water (now mains – combi boiler) when it shuts on and shuts off water
-Mixer shower: quiet if turned to full cold or full hot but causes a restricted whoosing type noise on the cold water pipe work if set at a temperature you’d want to shower at. Looks to be a Triniton, probably 5-8 years old judging by bathroom and probably installed prior to the combi boiler upgrade so not sure if it is compatible with combi and mains pressure.

Background info:

I’ve lived in the house for 6 months so have inherited the pipework. A combi boiler was installed 3 years ago and the old header tank/boiler pipework structure was adapted to make it work. Result is mains cold water heads on old (15mm or old 1/2in) piping to the loft from the kitchen mains to the upstairs bathroom and back down to the kitchen for dishwasher & washing machine. The shower has separate plumbing (15mm) off of the mains line before it tees off into a (¾ or 22mm) to the bathroom (back to 15mm for bath, toilet, sink) and down to the kitchen (again on tee’d from ¾ or 22mm to 15mm piping).

I haven’t tested the actual water pressure, but outside hose is powerful as is the shower and taps in the house.

Questions!
- We will have a new kitchen fitted at some point, is it best to plumb in the dishwasher & washing machine from the mains input into the kitchen instead of routing up to the loft and back downstairs?
- Where do you usually install pressure reducing valve? Would it be ok to do it in the loft – if I did it at the mains after the stopcock (and outside tap branch!) water would have to climb up to the loft at reduced pressure so if I put it in the loft I could keep the higher pressure for the rise and reduce it for the bathroom/kitchen when it comes back down again – I don’t know if that’s logical?
- Water arrestor – I was thinking about plumbing this in @ the dishwasher if the PRV doesn’t solve? Plan was to purchase and fit PRV first though.

Thanks,
Matt
 
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I would try the shock absorber first, if problem still persists you could cut a gate valve into the distrobution pipe from your cold water storage cistern and close it off slightly, cheaper alternative to a PRV
 
Could be as simple as loosening the valve case or fitting a metal plate to the side of the water storage tank with the ball valve passing through it.
 

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