[Jefferx]

Hello:

I am working on installing a new shower and I ran into a pressure issue. The hot and cold water supplies are 1/2" copper pipes and delivering 80-85 PSI to the valve (Luxart 401) which connects to a tub spout and 3-Way Diverter Valve, then it connects to a Hand Shower and a Rainfall shower.

If I set the diverter valve to just the hand shower I only get 55 PSI, if I set the Diverter to the Rainfall shower and hand shower the PSI drops to 20 at the handshower, while rainfall shower seems keeps good pressure.

Any ideas what may be causing the issue? Thanks for your help!

 

[BC Plumber]

Depending on the fixture and GPM requirements, you could need a 3/4" or even 1" supply for hot and cold. Its the volume of water that will be an issue. Read the manufacturers specs

 

[Jefferx]

Both valves have 1/2" inputs, both fixtures are 2.5 GPM, figured 1/2 supplies could handle that.

 

[jagans]

You did not solder on the valve did you? Just asking to eliminate possibilities.

 

[joecaption]

A 3/4" supply can supply almost double the CFM of a 1/2 line.
It's lack of flow not pressure your dealing with I'd bet.
http://www.plumbingsupply.com/flow_charts_for_pipes.html

 

[Jefferx]

Removed the flow restrictor on the hand shower and it fixed the pressure issue. Thanks for the help.