Is there an electronic air valve with dump feature? Air leveling question

[Scott & Heather]

Good advice on the high pressure differential issues. It seems the easiest way to do this would be square one. Just using two normally closed solenoids per bag with a dump TEE in the line. I can get solenoids for less than $10 all day long. So I can't see spending $700-800 on a more advanced system. Worst case, I'll retain my manual system that's similar to Daves (sledhead). This isn't rocket science and I know several of you have made custom systems that work. So instead of trying to reinvent the wheel, I'll just try two solenoids per bag with a dump TEE and if they don't hold air, I'll go manual. Thanks again for talking me through this. And for future searchers, air leveling with your auto levelers removed is truly a viable option for minor to medium leveling. My bags are recommended to not exceed 100 psi. So I can run 90 psi for max inflation and of course dump completely to 0 psi for minimum inflation. I haven't measured the actual inches of travel but it's decently substantial. For us, touring sometimes several months per year from Truck stop to truck stop and hotel parking lot to hotel parking lot, this is the perfect, cheap, and effective leveling system for account for pavement slopes.

[Jim Eh.]

If you just wish to dump the air from the bags and not adjust the height then you are looking for "pilot valves". They come in both air controlled or electric control. Neway, Meritor Haldex plus others all make them.

[luvrbus]

Any thing is possible with a manifold and valves with air,I like KISS system myself though 
 

[TomC]

Yes in reading my explanation, I positioned the T for the exhaust and air pressure solenoid between the cut off solenoid and the air bags. Thank you for the correction. Good Luck, TomC

[Scott & Heather]

Jim I'm wanting to do both. Dump air to level and add air to level. Two normally closed solenoids should do this im hoping


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[thomasinnv]

What about using self relieving regulator valves? The same kind of regulators used for the park brakes as well as some of the other systems. The 279E1 is available with knobs instead of the adjusting bolt, be pretty easy for adjustments.

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[Scott & Heather]

Two thoughts:
1. You have to spin those regulator knobs a ton to get them to do any dramatic pressure change. And they dump so so slowly.

2. I don't want to run air lines to the dash. My dash is super crowded already and adding more air lines under there has been causing me problems already.


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[eagle19952]

Two thoughts:
1. You have to spin those regulator knobs a ton to get them to do any dramatic pressure change. And they dump so so slowly.

2. I don't want to run air lines to the dash. My dash is super crowded already and adding more air lines under there has been causing me problems already.


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it can be done with spring centered two throw switches and the run tees and 12v solenoided valves.
4ea. SPRING centered MOMENTARY sw. being off
and up adds air
and down exhausts....
using NC VALVES.

[Scott & Heather]

^ tell
Me more! Exactly what I'm trying to build


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[Oonrahnjay]

^ tell Me more! Exactly what I'm trying to build

     Scott, here's a Jameco R-13-66-I-02 which is a three-position with the push-top and push-bottom positions momentary.  When it's in its released, central position, it does not make any connection.  (The "02" at the end of the part number is the connector blade type, I'd use the .187" connector blade but you may have other connectors.  Also, note the "I" digit which is a letter I.)

     I've never seen one of these for real or used one, but it's an illustration of what's out there.

[eagle19952]

3p spdt ...momentary

they make all types.
this one is solder on. but i do not know if it is spring return momentary
https://www.circuitspecialists.com/66-1226.html?otaid=gpl&gclid=CJzNzPCkkNMCFYE9gQodEaUBGg

spade lug.momentary this one seems expensive ...

http://www.steinair.com/product/toggle-switch-3-position-spdton-off-momentary/

google this...
toggle-switch-3-position-spdt on-off-momentary

https://www.google.com/search?q=toggle-switch-3-position-spdt+on-off-momentary&oq=toggle-switch-3-position-spdt+on-off-momentary&aqs=chrome..69i57&sourceid=chrome&ie=UTF-8

[eagle19952]

this one looks nice. i just prefer screw landed

here is a screw landed. but you should research spring reset...recenter.
but..if you are aiming regulated air...i guess it would not matter.
and consider...you may not want to hold the switch to exhaust..
but... if you forget to center the switch...u might defeat the duty cycle of the solenoid.
i would want spring resets.
iirc...normaly momentary is spring reset/recentered. just confirm to be sure...my two brain cells are arguing this day.


https://www.kimballmidwest.com/All-Products/Electrical/Switches/Toggle-Switches/28975/

[Oonrahnjay]

this one looks nice. i just prefer screw landed

here is a screw landed. but you should research spring reset...recenter.
but..if you are aiming regulated air...i guess it would not matter.
and consider...you may not want to hold the switch to exhaust..
but... if you forget to center the switch...u might defeat the duty cycle of the solenoid.
i would want spring resets.
iirc...normaly momentary is spring reset/recentered. just confirm to be sure...my two brain cells are arguing this day.


https://www.kimballmidwest.com/All-Products/Electrical/Switches/Toggle-Switches/28975/

    Yeah, Don.  That's a spring-center (spring release).  The convention in the industry seems to be parentheses, e. g. (on) - off - (on) means a switch that's momentary in both positions.  If someone really wants a switch that's momentary on when you're adding air and sticks off when you're venting (I don't), then it would be a three-position (on) - off - on switch.
    A genuine momentary-in-both-positions (i.e. you take your hand off the switch and it goes to off) is here:

https://www.delcity.net/catalogdetails?item=27300050

    Between all the options, (push button, rocker, lever toggle, etc., connections large or small spades, screw-type, etc., color etc.) there is a lot of confusion in these
catalogs.  But the right switches are there.

[Scott & Heather]

Good stuff. But I will say that sometimes if I just want to dump air, I do not want to hold the switch in dump mode. It takes minutes to dump and I've been having to do that and it's a pain. They really don't have to be momentary. I can regulate the full air to not exceed 90 psi. Problem solved.


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[sixtyseven]

Scott,   If you really want to spend hours mind boggled and overwhelmed check out this....   like a kid in a candy store   

https://www.grainger.com/category/pneumatic-valves/pneumatics/ecatalog/N-17ta