Max Flo: Is this HP or LP?

[dnm5d]

I have a max flo reg, how do I find out if this is high pressure or low pressure?

[dnm5d]

here's a pic in case it helps...

[AutoMaggot]

There should be two gauges, an input, and an output... if there is another silver knoby thing sticking out the top (which i cant see), then its a high pressure.

[TigerMan]

If you have air, turn it on. If it's able to go above 300, then its a hp. If it only goes from 0-400, then it's a lp. If you don't have air, you may be able to tell by the output gauge (if it's a lp).

[dnm5d]

Unfortunately I dont have air and wont be able to get my tank filled for awhile and was hoping I could get it sold as soon as possible. It only has one guage, that goes from 0-4000 psi. I guess it's missing the output guage? I dont see a silver knob that sticks out.

[Ityl]

Does it say shocker on it anywhere? Ones that say shocker were LP.

[ChucktheMAGician]

Originally posted by Ityl
Does it say shocker on it anywhere? Ones that say shocker were LP.

Unless the previous owner changed the spring! Either way you will need a gauge to monitor outgoing pressure.

[dnm5d]

Thanks guys. I dont see shocker on it anywhere. Guess I'll have to get my tank filled and grab a guage. Was hoping there's some way to look at it and find out :)

[Doc Nickel]

These guys are all so helpful!
Am I the only one that uses Max Flows?

Anyway, it looks like an old style cradle- not only is it likely an HP reg, but might even be a PVI unit rather than an SP. If it is (more below) then look out, because some pieces, notably the main seal, are no longer available.

Anyway, a quickie indicator- if the big hollow nut on the back (tank end) of the reg is stainless steel rather than black-annoed aluminum, it's very likely a PVI unit.

As for HP vs. LP, unscrew the front adjuster cap. If the brass piston in the body of the reg is roughly 1/2" in diameter, it's a high-pressure reg, good for more or less 450 psi and up (though it'll go lower, and there's a "medium" and "high" pressure spring.)

If the piston is closer to the diameter of a nickel, then it's an LP reg. Good for about 250 psi and below.

If it's not whichever style you want, or a PVI reg, drop me a line, if you're interested in selling the setup.

Doc.

[dnm5d]

I emailed you doc.