RO/DI shut off valve, how is it supposed to work?

areze · 07/12/2008, 01:53 PM

I guess 1 side gets back pressure, the other side is supposed to close?

I installed it, 1 side is on the output, the other side is on the line from filters to membrane.

but its not stopping... obviously I seal the output, but the waste line continues to flow. what gives? is it backwards or what?

Jefe12234 · 07/12/2008, 02:07 PM

It usually takes a minute or two to close, and when you drain the system it may not function until the air is removed which may take a while. Just close the output and let it run for a while. Also, I don't remember if they're directional or not, but check for any arrows or directions on the valve.

OliverM3 · 07/12/2008, 02:20 PM

It definitely takes a while to close from back pressure.
Mine takes a good 10-20 minutes till you don't hear any waste water flowing.

Never timed it but just watching it I would never hear it stop.
But coming back a half hour or hour later and everything was fine.

Here's my setup:

areze · 07/12/2008, 02:38 PM

ah, I didnt give it much in the way of time. there are some air bubbles in the DI container also.

07/12/2008, 01:53 PM	#1
areze Registered Member Join Date: Aug 2005 Posts: 4,048	RO/DI shut off valve, how is it supposed to work? I guess 1 side gets back pressure, the other side is supposed to close? I installed it, 1 side is on the output, the other side is on the line from filters to membrane. but its not stopping... obviously I seal the output, but the waste line continues to flow. what gives? is it backwards or what? __________________ current tanks:240g of wallet draining capacity.

07/12/2008, 02:07 PM	#2
Jefe12234 Registered Member Join Date: Apr 2001 Location: MN Posts: 885	It usually takes a minute or two to close, and when you drain the system it may not function until the air is removed which may take a while. Just close the output and let it run for a while. Also, I don't remember if they're directional or not, but check for any arrows or directions on the valve. __________________ Serenity now!!!

07/12/2008, 02:20 PM	#3
OliverM3 Registered Member Join Date: Aug 2007 Location: PA Posts: 616	It definitely takes a while to close from back pressure. Mine takes a good 10-20 minutes till you don't hear any waste water flowing. Never timed it but just watching it I would never hear it stop. But coming back a half hour or hour later and everything was fine. Here's my setup: Last edited by OliverM3; 07/12/2008 at 02:25 PM.

07/12/2008, 02:38 PM	#4
areze Registered Member Join Date: Aug 2005 Posts: 4,048	ah, I didnt give it much in the way of time. there are some air bubbles in the DI container also. __________________ current tanks:240g of wallet draining capacity.