General question about regulators

[Sorvete]

So, I understand how most pressure regulators works, what I cant figure is why some (most) needs a vent hole. Why they need to be vented?
I just bought a Huma regulator for my BT65, waiting for the shipping, and in the meantime I want to FULLY understand how they work and what could happen if I don't make that venting modification on the pressure tube. 

Thanks!

 

[Ronin001]

Good place to get some understanding is Robert Lane and he does fairly well at describing all about regulators. Here is a link to his YouTube

 

[Sorvete]

Awesome, exactly what I was looking for. Thank you!

 

[30cal]

I have a Huma regulator in a Marauder. It vents though the gauge hole so doesn't require a hole to be drilled. You just leave off one o-ring on the gauge block. The Hatsan may be similar.

 

[Sorvete]

The instructions provided by Huma, specifically for the Hatsan regulator, show two methods for venting the regulator. One is to remove the o-ring and leave a tiny gap between the air reservoir and the original valve The second method is to carve a notch along the valve threads and on the air reservoir with a small file. The first method is totally reversible, which is nice, but I am afraid it could leave the reservoir tube kinda loose.

 

[30cal]

I don't have a Hatsan so cannot add anymore help with that. But I do like the Huma reg.