cmartin

i removed old bath taps and replaced them with ceramic disc one the flow has been reduced y is this the taps r ment 4 hi and low pressure systems all the pipes r 22mm and it has full bore lever valves with double check valves as stated in the instructions aswell as the water regs .does the check valves affect the flow .the system is a gravity one .many thanks

ajs heating

even though they stat lp on the instructions does it stat in bar what it recommends.
example 0.5 bar.
yes as you say it willbe the check valve thats restricting the flow. as they have a spring in them.
you can try a single check valve. as your only mixing cat 1-2 water

cmartin

0.5 upwards .y do they state dcv when a single is adequate

ajs heating

you have removed two taps hot/cold.
and replaced with two taps ?
or one tap that does both hot/cold (monobloc) ?

cmartin

monobloc

removed a mixer and fitted a mono with shower attachment

ajs heating

>0.5 upwards .y do they state dcv when a single is adequate

don't ask me, they seem to print one set of instruction for the whole world.

i don't know if you know how to work bar out but

1m gives you 0.1 bar
so 10m = 1.bar
in a standard house your distance from loft cws to the taps willbe 6ft, 2m, which is 0.2 bar.
if i ever fit taps on gravity i try to stick to taps that will work on 0.1 bar.
but cartridge taps very rare to get lower than 0.5 bar cause of the small diameters inside.
so you are about on the limit as i would say, try fitting single check valves as your only mixing cat 1 / 2 waters which is a type ea valve (single check valve)
if you have a water regs book. page 6.19.

cmartin

many thanks for the help

ajs heating