Non-return valve

Richi888 · Apr 20, 2024

Hi,

Im trying to build a RO system and got some question regarding the non-return valve:

1) Do I need it for permeat only, or both permeat and concentrate, and why?

2) Is it okay to fully eliminate the non-return valve from the system?

Kind regards

KStatefan · Apr 20, 2024

It will depend on what all your system includes like auto shut off valve, drinking water tank. Russ @Buckeye Hydro can give you better answer.

Richi888 · Apr 20, 2024

It has no tank, direct flow.

Buckeye Hydro · Apr 20, 2024

Richi888 said:
Hi,

Im trying to build a RO system and got some question regarding the non-return valve:

1) Do I need it for permeat only, or both permeat and concentrate, and why?

2) Is it okay to fully eliminate the non-return valve from the system?

Kind regards

Sorry but I don't know what a non-return valve is. Are you talking about a check valve?

If so, you'll want one on the permeate tube. It prevents flow of water backwards across the membrane. Backwards flow across the membrane layer of an RO element will damage the membrane.

For anyone with an ASOV... the ASOV won't function without a check valve on the permeate tube between the RO membrane permeate port and the low pressure port on the ASOV.

A check valve is not needed on the concentrate tube, although it won't hurt anything if you have one.

Russ

Richi888 · Apr 21, 2024

So install it directly after then permeat exit of the housing?

KStatefan · Apr 21, 2024

Yes. A lot of set ups will use a fitting with the check valve built in. If your membrane housing came with fittings it might be there.

Richi888 · Apr 21, 2024

KStatefan said:
Yes. A lot of set ups will use a fitting with the check valve built in. If your membrane housing came with fittings it might be there.

Yes I know them but I need 1/4" thread to 1/4" quick connector. Do you know where I can buy this? All of them only have 1/8" thread