RO systems & flow restrictors

[Doug]

Originally Posted by mark

Looks like your purge valve has a different function than my flush valve, seems yours will run tap water downstream to your membrane (I'm assuming no DI). What the flush valve does is in the closed position provides a fixed restriction on the waste line, in the open position there's no restriction and water just flows past the membrane to clear it.

Ok, I see how the flush valve restriction works. Thats how my own unit works then and why my drain line is wide open in the end, as compared with the other unit. Thanks.

Thought the fixed valve gives close to 4:1 with the variable valve I can get the ration to 1:1 though at the cost to the life of the membrane.

Thats interesting.

For the ro, mine has 1 input and 2 outlets (filtered and waste), the resistor is on the waste line (diagram)

Whoops. Right on. I was just going to ask you that. Must have missed it first read.