Air running to FB and TF when FB in use

[2Biz]

The cv issue is a mystery to me? Sounds like your LP air is set up like mine. With an air regulator for each LP service located between the solenoid and bay. I originally took all cv's out of the attic, but since I share single air lines, air pressure would backfeed to other air regulators causing them to leak air. So I had to put a cv on each regulator. That's all getting fixed shortly....I'm installing an all new LP system where a single regulator sets pressure for all 4 bays for a single service. That way the solenoid is between the regulator and bay. The solenoid will stop any backflow which should allow me to get rid of all remaining LP cv's. I know it would be a lot of work for you, but maybe you could try something similar.

 

[2Biz]

Even if you did something similar, you still may have to put a cv on the weep, but that could be done in the ER. The only cv's I have in my trough are for sfr. No way around that! Another benefit, I don't weep any LP service!

 

[MEP001]

Did you get the Buna-N or Viton o-ring check valves? I've found the Teflon seal ones need high pressure to form the seal to the valve and make a positive seal. I can often blow some air through the wrong way when they're new.

 

[slash007]

Did you get the Buna-N or Viton o-ring check valves? I've found the Teflon seal ones need high pressure to form the seal to the valve and make a positive seal. I can often blow some air through the wrong way when they're new.

I bought the teflon version after reading comments here on the forum. Are you saying they need high pressure to form the seal initially then they work fine?

 

[MEP001]

The first time I tried them I had some low pressure backing up through them for a few days before they finally made a 100% seal. I'll only use the Teflon ones for high-pressure, mainly because I've seen high flow blow the o-ring off the other ones. The Teflon one won't come off that easily. The o-ring will make a positive seal when they're new and isn't going to come off with low pressure flow.

Maybe try a rebuild kit with an o-ring in a couple of bays.

 

[cwguy.com]

I never ran into the problem mep1 stated.... but obviously his statement must be true. I must have purchased viton cv's before?

What about removing all the valves then for your weep adding a relay system that opens the air for the tf and brush in all the bays?

I used these cheap pvc cv to add weep for my brush in 2009. 1-2 have broken since then I believe? https://www.kleen-ritecorp.com/p-7902-14-fxf-pvc-check-valve.aspx
I also added the block in the equipment room.

 

[slash007]

I have been out of town for a few days, but was able to get KR to agree to accept the check valves. They will send them to Fluid Controls for evaluation, but will credit me even if they are repaired or replaced. In the meantime, I need to buy replacement check valves so that I can remove the bad ones. I bought the FC valves based on all of the feedback from here, but now need to go in a different direction. Considering that I am using these for weep and chemical on only FB and TF, what is my best bet?

I climbed into the attic earlier today and put on 2 old used cheap check valves and they worked fine. So the issue is the FC Teflon valves for sure.