GHL Profilux Standalone Doser

[Canadian]

I didn't realize this unit required check valves. There's no mention of it in the instructions. And there's no mention of where they should be installed (before or after the pump - on my AquaMedic they are installed both before and after the pump). But I wasn't sure if 3 rollers was enough to negate the use of a check valve as the Liter Meter III has 4 rollers and does not require check valves.

Does GHL Profilux sell check valves or is there a brand they recommend?

[Jason McK]

There are great JG check valves I believe OA sells them.

[Canadian]

Jason,

Do you know what kind of PSI the John Guest valves operate at? As far as I know they're designed specifically for things like beverage units which presumably operate at a much higher PSI than a peristaltic pump. I'll get some John Guest check valves locally if they are appropriate for the application (i.e. don't put so much strain on the pump that they either cause too much back pressure and somehow damage the pump, or drop the flow rate to incredibly slow levels). But I can't find anything about the specs on John Guest's site.

[Canadian]

Never mind. I found the specs: "crack open pressure" is 0.02 BAR (where 1 BAR = 14.5 PSIG)

Info found here just in case someone searches Canreef for this kind of information in the future:

http://www.johnguest.com/linkpages/TechSpec11.html

[Jason McK]

I used them in my Kalk Stirer with 0 PSI and they operated fine

J

[Canadian]

Michael,

Where should the check valves be placed - before the pump or after the pump? Intuitively it makes sense to put it as close to the solution vessel as possible (before the pump) to minimize as much back flow as possible. But I don't know if that would some how impact the dosing pump in a negative way (typically throttling back the intake of any pump is bad news) as there is nothing indicated in the instruction manual about check valves.

[Aqua-Digital]

Makes no difference before or after, but personally I would put after

[don.ald]

so are check valves required on the doser? or was this specific to canadians set-up?