Plumbing-flickmixer questions.

I am about to fit a flickmixer in the new kitchen.
The warranty states that it will be void if the pressure difference between the hot & cold is more than X amount. (can't remember exactly, but not many KPAs)
I am on bore water with a pressure pump that bulges low density polypipe, and am using an instantaneous gas HWS that puts out quite low pressure so I am thinking of fitting a PRV from an old HWS (that had a sheperds crook on top) to the cold water line that feeds the flickmixer. This should bring the H & C lines to a pretty close pressure match.
Can anyone see a problem with that?

Second question, is a standard tapered union (nipple?) suitable for the flickmixer hose connection to the copper lines? The flex hoses have rubber seals that look like they would be fairly adaptable to seating on a taper like the ones that use brass ferrules on the copper pipes.

Thanks,
Phill.

The flick mixer should be connected via a couple of valves - hence the rubber washers. That would also give you the ability to regulate the pressure of the cold water.

Thanks Silent. What sort of valves are you referring to? I looked up valves and there are so many, Stop valves, PRVs, Ratio valves and it goes on......

Phill.

Don't know the technical term but they're little gizmos with handles about the size of a 10 cent piece. Tried to find a pic but they only want to show us flick mixers and fancy tapware. If you go to a place that sells plumbing supplies, they'll be able to point you in the right direction. You fit them to the end of your copper and then the flick mixer flexible hoses screw onto them.

Like this: http://www.dunnings.com.au/index/result?code=DVMCC

Mini cistern cock/stop/valve apparently...

Thanks Silent, I know what you mean now.

Phill.

A mini cistern cock wont regulate static pressure, it will regulate flow, the mini cistern cock will act as a backflow device when installed under a flick mixer ( in sa it is a requirement to fit them). If you have extreamly high pressure and need to reduce it, then you need a domestic pressure reduction valve- still available at plumbing stores, and fairly cheaply too. The cheapest prssure reduction valve I know of is made by Zip ( the guys that make the Zip hot water units for tea and coffee) they cost about 8 bucks and go straight onto the minicistern cock before the flexi connects to it.