Idea for push button air tank drain

[Heavysteven]

Here is a picture of robr's auto horn drains installed.

Could you explain how these valves work? There automatic? So when they fill with water a floats opens the vent on the bottom? like a toilet?

 

[Billy Bobbed]

Could you explain how these valves work? There automatic? So when they fill with water a floats opens the vent on the bottom? like a toilet?

Automatic air drain valve lets out water from air tank(s) without the driver having to operate any valves or switches. Has a manual drain control built in to override automatic function. Will not clog from small debris in tanks (bits of rust etc). Compatible with all commercial trucks with air brakes as well as Military trucks with air over hydraulic systems (M35, M54, M813, etc) and M923 w/ air brakes. Drain valve has 3/8 inch ports and a 3/8 to 1/4 inch adapter pre-installed.

 

[Blood_of_Tyrants]

https://www.surpluscenter.com/item.asp?item=20-1452&catname=

From the description:

0.025" orifice, 10-32 Inlet and outlet ports

Man, that it tiny.

These are better suited.

https://www.surpluscenter.com/item.asp?item=20-1311&catname=air

https://www.surpluscenter.com/item.asp?item=20-1463&catname=air

 

[3dAngus]

From the description:

0.025" orifice, 10-32 Inlet and outlet ports

Man, that it tiny.

These are better suited.

https://www.surpluscenter.com/item.asp?item=20-1311&catname=air

https://www.surpluscenter.com/item.asp?item=20-1463&catname=air

Wouldn't you want 24vdc, in lieu of 24vac units?

 

[Castle Bravo]

Some people are using these horn drains.I'm thinking ROBR had these on his deuce.

Looks like the part # is a Bendix S-A271 or Haldex KN-24000.

Anybody have any feedback on using these? Seems like a neat idea. I'm not clear on how they function... They sense when the air tank leaks down a bit and then dump the rest of the air?

Do they have some way to account for an emergency unplanned drop in air pressure? I can't imagine they're unsafe if they are in use, but I'm still curious.

 

[Blood_of_Tyrants]

Wouldn't you want 24vdc, in lieu of 24vac units?

My bad. You are correct.

 

[ARYankee]

Yeah i would like to know more about the automatic ones as well. I do like that 24 VDC solenoid. You can always put a flow valve on the outlet so the air will dump slowly.

 

[m-35tom]

in 6000 miles i have NEVER had ANY water in the tanks with an automatic pressure swing air dryer. on ebay for $40 to $180

tom