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Shareing Blu/Dot air with air ride axels?


oletimer

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I have a Blu/Dot brake controller plus air ride on my 5th, and somewhere I read about using the truck air for both, but I can't seem to find where. Even if I used both tanks in the trailer, I would like to use the truck air for both so as not to have to use the small electric compressor for the ride. I'm sure there is a way to do that safely, but don't know how? Any ideas? Thanks, Dick T

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Understand the system. If you have Bludot brakes (air over hydraulic), the air tank in the trailer is always charged. If you LOSE air pressure from the truck, the slide valve applies the air in that tank to put on the brakes in the trailer. Now, I suppose you could connect your air ride to that, but if the air ride loses air suddenly, you would be unprotected in event of a breakaway.

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What if you ran another line to the air ride on the trailer, using a seperate line (not connected to the brake system)? You could even plumb in a seperate tank on the truck , with check valves (so it would not be connected to braking system) Put a quick connect fitting on it so it cant be confused as a brake line?

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I am also considering this (if I can keep my rig - still waiting on Ins. co.) and was thinking about putting a TPMS onto my air suspension schrader (sp) valve, so I would know if I've blown one of the 6 bags. I'm thinking that Dexter can tell me if I would only be measuring air pressure in the line from the Leveling valve to the bags.

Would like to do this to help inflate suspension quicker, and with clean air. Saves the leveling valve from getting corroded, and failing.

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We delt with this all the time in our plants. I'm sure that there is a DOT equivelant item.

 

It is European, but it has a neat video -

 

http://www.protect-air.com/en/products/hoseguardr-air-fuses/hoseguardr/

 

and we got them from Parker and others. You also have them in your trailer - think propane tank. When you first open the tank valve and wait for the pressure to build. They are an OSHA requirement but it is often overlooked.

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Bill, that looks like the way to go! Just put it on the main tank line going to the suspension tank. Sounds as if the suspension tank is losing air quickly (will need to figure that amount out), and if I have a monitor on leveler valve line, I should have no problem or brake problem with these.

 

Heck of a time trying to find purchase location and price!

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Rock - try this catalog - I just used that for the demo and it had a demonstrative video.

 

Their contact info is - http://proportionair.com/wp-content/uploads/2014/06/Protect-Air-USA-Catalog.pdf

 

basically - what you are searching for is device for

 

"OSHA safety STANDARD regulation 29CFR CHXVII PARAGRAPH 1926.302( B)(7) STATES: All hoses exceeding 1/2-inch inside diameter shall have a safety device at the source of supply or branch line to reduce pressure in case of hose failure."

 

Parker - http://www.parker.com/literature/Literature%20Files/pneumatic/UPD_2010/Catalog_0726-E.pdf --- their table is complicated

 

Hose Reel - http://www.hosereels.biz/files/959275/uploaded/OSHA%20SHUT-OFF%20VALVE%20.pdf --- pg 2 - 1/4" size closes at 23 to 29 scfm - ie hose breakage

 

LOL - It all reads good on paper, but I thought the video --- said it all.

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Rocky - How about this - http://www.alkoncorp.com/catalog/2010-transdot-catalog-web.pdf - page 33 part #PVA44 suffex 8 - opens at 85 and closes at 80 psi (and I'm sure most other compaines have one similar.

 

or http://www.fleetpride.com/docs/exclusive-brands_prima_brakes_components/air-brake-components.pdf?sfvrsn=2 - a Fleetpride catalog, pg 38, av286500 cross ref - 286500

 

DOT certs - Pressure protection valve -

 

Truck air comes up, at 65?? the truck bags inflate, cab ride and air seats come up, At 85 the trailer PPV opens, trailer bags come up.

 

When your trailer suspension line breaks, your air varies between 80-85. When the truck suspension lines break, you vary between 60 to 65.-- instant diagnostic tool.

 

or -- the PPV first, spirit and intent of the DOT approved and the hose whip second. Then you'll maintain a higher pressure but still cycle the compressor more. (not a DOT authority and slept in my own bed last night)

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If air suspension has its own tank you put a pressure protected check (ala Bendix PR-3) in the brake tank and plumb 3/8 purple from it to feed your suspension tank. If air suspension shares the same tank as the brakes then you use a normal pressure protection valve ala Bendix PR-4 or one of the bigger GT/Velvac (ala 032219) valves that threads right in and plumbs to leveling valve.

 

If you want the trailer to kneel everytime you park (ie: anti swaying when you walk into it, or anti-can't ever forget to dump suspension before leveling trailer) you get another one of your Sealco pilot valves and plumb like this:

 

03.gif

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Thanks guys, I will try to digest all this in the near future. It seems I have so many projects right now my feeble brain is on overload. BTW, is there a valve to correct THAT?? I will work through this, but like I've said before, I'm old, slow, and dumb. As always, the knowledge on this site amazes, and humbles me!! Dick T

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OK Scrap, now I'm pretty sure I'm really confused!

I was agreeing with your first statement that I wanted a protection valve between my brake tank and my suspension tank! If I were to blow a bag, or something snagged a line, the alarm would go off from the monitor, and I would be using the rest of the air in the suspension tank to try and maintain suspension, while I am looking for a spot to pull over and have all brakes on the trailer to do it with because of the protection valve on the brake tank.

 

But if you now say to put it after the suspension tank, wouldn't that just shut down all air to suspension and leave me riding pretty low? And riding low for me is really just setting on the frame. On edit, (I should have said the frame would be setting on the axles.) Yes, I would still have brakes, but don't I want that air in the suspension tank?

 

And yes, I bleed down the suspension before leveling the rig.

 

And I'm really not sure about where the leveling valve is on your diagram? Does the air pass through your pilot valve and then go to both the bags and the level valve?

 

To me that leveling valve needs to be right before those bags, but I don't have the knowledge that you do, plus mine is a 10 year old setup that even Dexter doesn't show anymore!

 

I'm probably not reading your single tank diagram correctly.

 

Thanks.

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PR-3 goes on the suspension tank but it is still the inlet. So the arrow points towards the tank and it makes the check part of it all work just like the supply to two service tanks of your truck. The whole tank is also pressure protected but that doesn't make much difference to the suspension.

 

The diagram is actually Sealco's, but the pilot goes on the outlet line of the leveling valve (between valve and bags). So the pilot will exhaust the bags but it also exhausts the tank through the leveling valve to the pressure protect setpoint. Probably not the most efficient use of air but you don't have to buy a new leveling valve. You are right in that it will only work with the single tank system because the pressure protect is in the outlet. For dual tank you are probably best putting in a valve with a dump port and plumbing that in there instead.

 

Sealco also makes a manual valve that will dump it but also auto resets the next time you charge the trailer. That way you don't have to sit there and hold the pull cable until the trailer finally goes down. I'll dig it and a diagram up later this morning. They also have a suspension priority valve that will fill suspension before brakes if that is a wish or a need. There are so many ways to go with this when you aren't bound by 121!

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