RO problem with HP valve

[Maplewalnut]

Soliciting thoughts or hoping someone had similar issue

At start up, with raw sap my RO jumps right to 400psi and my high pressure valve does not adjust flow at all, not even a little. I can close it all the way or open it all the way and no difference in my pressure. Concentrate valve does adjust pressure so I know gauge is good. Have changed the HP valve and the check valve on HP manifold but still having issues. After an hour or so my flows even out to equal concentrate and permeate which is dreadfully slow for concentrating. Trying to troubleshoot over the phone with mfr but no luck.

Any thoughts?

Thanks
Mike

[blissville maples]

What type of machine is it?

So you back both valves off, start it up and it goes to 400 psi? I'm assuming you are in concentrate mode? Well can't be but a couple of things.

If your concentrating and your output is plugged fully or nearly fully that would cause your pressure to go up. I've seen hoses split, blow off etc. Being it only goes to 400 it wouldn't be fully plugged.

If the valves are installed correctly and nothing is blocking or plugging the port that should be ok, but that would be a cause.

[blissville maples]

What type of machine is it?
Is the valve new or recently replaced? ( Faulty valve?)

So you back both valves off, start it up and it goes to 400 psi? Psi doesn't go down by turning valve? I'm assuming you are in concentrate mode? Be sure all of your valves are configured correctly for concentrate mode.

with the concentrate valve turned all the way out pressure still at 400 and pressure valve does nothing? Almost seems like the valve itself

Make sure the valves are installed correctly, If valve is new it may be a defective one, perhaps it's not opening or closing. Somewhere something is pinching the concentrate flow causing pressure to increase. Is your concentrate output valve to your tank operational, that could cause a restriction.

[bowhunter]

If the pressure changes with changes in the concentrate valve and if the flows also change when the concentrate valve is adjusted then there is likely some restriction in the recirculation line. The line may be plugged, the HP valve trim could be off the stem and in the fully closed position or if you have a check valve in the recirculation line it could be stuck closed or installed backwards.

[Russell Lampron]

Hi Mike, Have you talked to Devin at Lapierre USA? He's the RO guru up there. I'd have to look at my RO to trace out the path from the concentrate out of the membrane to the HP valve to see what's in between. It seems that you have a blockage somewhere but I'm not sure how much stuff you'll have to take apart to check it and clean it.

Bowhunter, Mikes RO is Lapierre 600. It doesn't have a recirculation line, it has a pump mounted on the bottom of the membrane tower.

[BAP]

Could be the valve has either blockage or not moving internally. We had one once that the handle moved fine but internally it was broken and not moving. You could not tell by feel because it felt normal moving the handle until it was disassembled visually inspected.

[Maplewalnut]

All- thanks for all the responses. Devin and Erik are great to work with at Lapierre, it winds up a bad check valve just prior to high pressure manifold. All trouble shooting done on phone and it is back up and running

Thanks
Mike

[maple flats]

Isn't it great when the manufacturer can solve issues on the phone?