tyre inflators

[Tigger77777]

Hi All

This might be a stupid question but, tyre deflators will let the air out automatically to a preset pressure, is there an opposite device? A tyre inflator that cuts out at a preset pressure when inflating? Basicly you don't need to keep checking with a tyre gage, just attach the device to the air hose then to the tyre valve, walk away and let it do its job.
Cheers

[threedogs]

Its called a servo. lol
I haven't heard of any such product not to say there isnt one out there

[4bye4]

Unfortunally only at servos. Some have air stations you can dial a pressure and it will stop when that is reached. A portable device wouod be a bonus if you are on/off road all the time.

[threedogs]

Great idea for a new product for someone eh,,

[mudski]

Just get one of those ARB inflators, or similar, with the gauge on the unit itself. Just takes a lift of the thumb off the trigger and it shows the pressure...
http://www.nissanpatrol.com.au/forums/attachment.php?attachmentid=62299&stc=1

[Throbbinhood]

But then you have to stay there holding it..

[Winnie]

But then you have to stay there holding it..
I'm sure you could rig something up to hold it down.
http://www.nissanpatrol.com.au/forums/images/imported/2015/10/407.jpg

[ova50]

Some tyre shops did have what was called a "Green ring valve stem".
An Aussie invention, looked like a normal tubeless valve that was fitted to the rim the same as a regular tubeless valve.
After inflating the tyre to the correct pressure you could turn the stem so the green ring could be seen.
If the pressure dropped, the green ring could not be seen. The green ring would appear again when you inflated again.

Not sure if they are still available.
Best to ask a tyre shop
You can get those one that replace the valve cap but chances are they would get knocked off.

[mudski]

But then you have to stay there holding it..

What you want to do whilst the tyre is inflating for a few minutes?
My Aldi compressor, which is the same as those Mean Mother ones, just has the clip on chuck and it keeps pumping away until I look at the gauge. One could be made to fit inline from the chuck to the valve using a pressure relief valve so it just releases the air from the compressor but you'd need to put a one way valve in aswell so the air doesn't come back out once the pressure is reached. Could be made pretty easily. Is it worth your while though?
Hmm, I think I have most of the parts here to make something. I might have to look into this now...
Lol

[Throbbinhood]

I do heaps in the time that my tyres are inflating.. Clean the lights/mirrors/windows, put the snatchy away if it's not dirty, wind in winch rope, put any rubbish or whatever in a bag, socialize with others, etc.
Plus, means I'm not huddling over for a valve that's at the bottom leading to a sore back.
Mine has a clip on chuck, and I've got a digital pressure gauge that I use and just clip em on off every now and then. I know roughly when I'm close to pressure.
That said, would be great to be able to set 38psi and walk away, and when I hear the relief open up, time for the next wheel.

[the evil twin]

What you want to do whilst the tyre is inflating for a few minutes?
My Aldi compressor, which is the same as those Mean Mother ones, just has the clip on chuck and it keeps pumping away until I look at the gauge. One could be made to fit inline from the chuck to the valve using a pressure relief valve so it just releases the air from the compressor but you'd need to put a one way valve in aswell so the air doesn't come back out once the pressure is reached. Could be made pretty easily. Is it worth your while though?
Hmm, I think I have most of the parts here to make something. I might have to look into this now...
Lol

If you want to go "auto" for the vast majority of 12 volt jobbies then you will need an adjustable pressure regulator and switch.
The reg will have to be adjustable so you can set what pressure to inflate the tyre.
The switch will be to turn off the Compressor.
If you don't have that the compressor will just run it's guts out while you are dicking around elsewhere and not needed and either overheat or exceed it's duty cycle.

The reg is easy but the switch set up would be tricky

[Throbbinhood]

How do you get around the 'having to turn it off to read the right pressure' aspect?
As in, I've never had a gauge that was accurate when the compressor was still pumping, always have to turn it off first to be even close.

[Tigger77777]

Thanks Mudski,
I also have an portable compressor and from what you wrote I found this,
https://ditchingsuburbia.com/blog/on-board-air-compressor-installation
similar to your idea. Is it worth it? Maybe not, but I love to tinker lol.
If you do make one up show us some pics. :)

[Tigger77777]

Some tyre shops did have what was called a "Green ring valve stem".
An Aussie invention, looked like a normal tubeless valve that was fitted to the rim the same as a regular tubeless valve.
After inflating the tyre to the correct pressure you could turn the stem so the green ring could be seen.
If the pressure dropped, the green ring could not be seen. The green ring would appear again when you inflated again.

Not sure if they are still available.
Best to ask a tyre shop
You can get those one that replace the valve cap but chances are they would get knocked off.

Looks like "Green ring valve stem" is to do with Nitrogen, that was just a quick glance.
Cheers

[Tigger77777]

I do heaps in the time that my tyres are inflating.. Clean the lights/mirrors/windows, put the snatchy away if it's not dirty, wind in winch rope, put any rubbish or whatever in a bag, socialize with others, etc.
Plus, means I'm not huddling over for a valve that's at the bottom leading to a sore back.
Mine has a clip on chuck, and I've got a digital pressure gauge that I use and just clip em on off every now and then. I know roughly when I'm close to pressure.
That said, would be great to be able to set 38psi and walk away, and when I hear the relief open up, time for the next wheel.

That's the idea, more time for other things :)

[threedogs]

At OVA50 I have those TPMS its just a valve cap thats green
at 38 psi and should turn red when my pressures drop.
You can buy them for different pressures,

[ova50]

The Green Ring was invented by a Sth Aussie guy maybe around 1989 -1990. (I think his name was John Van Leeuwen)
They were to replace the std valve, had nothing to do with nitrogen.

I had some on a vehicle about 15-18 years back, but as mentioned, not sure if they are still available.
:cheers:

[the evil twin]

How do you get around the 'having to turn it off to read the right pressure' aspect?
As in, I've never had a gauge that was accurate when the compressor was still pumping, always have to turn it off first to be even close.

Thats why you need a pressure reg.
It will decouple the supply pressure (compressor) from the tyre pressure

[the evil twin]

Any amount of gizmos out there...
Here is a couple

LED self adjusting http://www.ride-on.com/smartcap.html

Red/Green plunger style http://www.redcatindustries.com/tyre-pressure-indicators/

[Avo]

I have one of these ones,most of the time the tyres are all the same,gives me time to do other things as others have suggested

[threedogs]

http://www.redcatindustries.com/tyre-pressure-indicators/
This is the style I have,,,,, available as Clunk stated with 3 different prices
but nothing to do with pumping them up

[mudski]

If you want to go "auto" for the vast majority of 12 volt jobbies then you will need an adjustable pressure regulator and switch.
The reg will have to be adjustable so you can set what pressure to inflate the tyre.
The switch will be to turn off the Compressor.
If you don't have that the compressor will just run it's guts out while you are dicking around elsewhere and not needed and either overheat or exceed it's duty cycle.

The reg is easy but the switch set up would be tricky
You'd need a normally closed switch of some sort that you could manually adjust to your desired pressure. If one does exist, which I assume would. Then wire this in to the compressor's power supply and have it set to open the circuit when the desired pressure hits. Somehow. Lol.