Thanks for the answers :
No. Just throttle the tap by turning it off or not turning it on in the first place. I note you say certain taps so does that mean some of your taps do and some don't? if so fit a isolating valve upstream of the taps that do and tweak it down so the flow out of the tap is reduced to such a flow when opened that it does not affect the shower (hopefully as per other taps)
Some taps have a better flow (less restriction) so drop the pressure more. Others have (I guess) smaller internal passages so restrict the flow more & have less effect on the pressure.
You could fit a flow restrictor to the pipes that feed the taps that cause the big pressure drop. That would have the effect of limiting the flow from those taps and therefore reduce the pressure drop to the shower.
Yes, but it also has the effect of restricting the flow when that's not needed.
I think you need an accumulator, it's a tank rather than a valve
No, an accumulator won't help - at least, not for more than a few seconds or fitting a really big one (which we haven't room for).
And expensive so just make sure nobody turns the tap on whist in he shower
Well that's what I try to do - if SWMBO is in the shower, I'll restrict how much I open taps. But she often "forgets" if I'm in the shower, or visitors are in the house, or there's a combination (perm any combination) of washing machine running/toilet flushed/taps being used.
At least since I replaced the combi with a thermal store, and removed a lot of redundant pipework, the shower just reduces in flow - it doesn't do the "normal, dribble, run cold, back to normal flow but cold, suddenly scolding hot, ..." tricks. Personally I'm not all that bothered, it's not generally that bad, but I get earache from SWMBO regardless of how little the flow drops
The ideal would be to fix the low dynamic pressure. But that would mean (I assume) paying the water company to replace the service pipe, and regardless of the cost, it would mean them digging up some of the tarmac in the ginnel between us and the neighbours - and probably the road as well.
But based on your responses, I guess there isn't such a valve. Worth asking just in case.
