Bath Filler water pressure

[fourstardan]

I have a bath filler and im really not sure it's going to be decent enough pressure for filling a bath. It feels like it will take 15 minutes to run the bath.

Its a scudo with valve. Lots of other oems using this design as well if it helps.

https://www.britishbathroomcompany....CAiD42nNu452...

The pressure is slow and very poor on the cold feed with cold on 22mm dropped to a 15mm run with pegler isolator and then into a 3/4 15mm tap connector.

My gut here is the valve then has these on the connector with 8mm bore.


Am i on a hiding to nothing with this valve?

[Windy Miller]

You could replace the isolating valve with a full bore ball valve and that would negate your concerns over further pressure drop. A single restriction generally has not a huge effect on pressure drop - Its more the cumulative effect. One technique for flow measurement is to measure the pressure drop across an intentional restriction, and translate that into flow. Despite having the intentional restriction, the pressure generally recovers back to almost what it was.

If you have lots of restrictions, or as with a small bore pipe, a very long restriction, then the pressure is always going to suffer.

Traditionally, with gravity fed systems, bath taps were always done in 22mm / 3/4". With the advent of high pressure hot water systems, some dropped this down to 15mm / 1/2". When I plumbed this bath here, I used 22 all the way to the bath filler, as the bath is oversized. With that, its full bore 22mm high pressure all the way, bar a solenoid operated valve that turns the water on and off from a push button on the bath.