My Tri Foam system uses a procon pump and it has a single check valve at the kip manifold inlet. But its plumbed for weep which I don't use. I can see the need for that one if I used weep.
Just yesterday, I had somebody using PS and holstered the gun with a lot of time left on the meter and left the PS running. Except the weep gun was restricing flow. I must have a failing/weak air CV at the boom because PS backed up into the ER and was pouring out the air regulator (Air side of the PS). Switching to HP sealed the CV and stopped the leak by. So I disabled the PS till I have time to get up there in the morning and swap the CV.
I'm in the process of getting all my parts to move the Tri-foam to the FB and moving PS to the Trifoam boom....Theres lots of benifits by doing this. (Thanks CB80 for the suggestion! I'm on it!) By moving the trifoam system over to the FB, this opens up a switch position so I'm adding Tire cleaner. Hence the CV questions.
Eric....CB80 and I both winterize the LP systems using washer fluid and air injection. I don't have any check valves for the FB. I've never had any backflow issues, even with as bad as last winter was. I didn't know if combining PS and TC to the same gun, especially since I'll be running them through a single foamer, if that would create any back flow issues. It Sounds like it won't be an issue.
CB80, Thanks!!! I CAN get crazy with the plumbing, so I wouldn't rule anything out! I know I can combine/eliminate air solenoids with the winterizing PLC, but I'm not as risky as you! So I'll have three Wyes on each foamer for PS, TC, and washer fluid/air injection. I'll have to add a few more relays for PS and TC input to the PLC so they can share a single washer fluid/air cycle. But that is fairly easy to do.
Thanks for all the replys...So No CV's needed. I'm happy with that!