Output Pressure/Mags Operating Pressure

[Bluntman]

I was wondering what I should set my regulator to. In the automag faq it says "The output of your air source should be around 700-800psi, but the AIR valve regulates the pressure down to 375-450psi and uses this pressure to fire the ball." and in the automags owners manual it says the blow-off valve cuts pressure at 650, soo... why do I need to set my output pressure at 700-800, shouldn't I just have to set it at 650, or 450? I'm sure there's a reason, I just wanna know it.

[Lord Vader]

Well, that blow-off valve is set to vent if the operating pressure is set to 650 or above. I.e., if you have the velocity set too high. It has nothing to do with input pressure. The reason you want a good 200-300 pressure difference between the input pressure and AIR valve reg pressure is so that you have a nice recharge buffer between the two pressures. This helps prevent starving the valve under rapid fire.

[HyperSnyper]

I had an interesting small chat with my engineer friend. He got his Undergrad locally here at UH, then got his Masters degree at Colorado State. He's in Flow Dynamics and Heat transfer (was suppose to work for NASA).

I asked him about input pressures and their relationship to a regulator's ability to regulate. Will a lower input pressure (to the reg) get more consistet post reg pressures, or can a higher input pressure perform just as well?

Anyway, he said that (oh God I think I got this mixed up !) In a static system or dynamic system, whether gas is moving aorund or through an object, it should not change the regulators ability to regulate.

With this is mind, I guess any pressure will work and get the same consistencies.

All I can concluce about this is that maybe lower imput pressures are there just to give more ease to the reg's seal.

Tom? Mods? Techs? Anything that needs to be added? Or corrected?

[PyRo]

I would think that more pressure would make the reg seal faster? It doesn't really matter. You can run about 650 up to 1500 with no problems.