Lowering input pressure=lighter pull?

[warbeak2099]

I know if you have an adjustable tank you can crank it up and get bounce on an RT valve. Well, can you crank it down and get a lighter pull? Let's say I have an x-valve w/ ult and I crank the input pressure down to around 700psi. Will a lower input pressure lighten the pull?

[Rather]

Its possible.. but it will deffinately slow recharge rate and lower the max ROF.

[Rift]

Like Rather said doing so will slow down the recharge rate it will give you a bit of a softer pull but its not that huge. You will also be alot more likely to chuff if the valve isnt getting enough pressure.

[warbeak2099]

What's the minimum that the valve needs? As long as you keep it above that, it shouldn't chuff right?

[Rift]

most people usually keep there input pressure at anywhere from 800 to 900

[eNder159]

to operate a mag you need ATLEAST 650 psi running into the dump chamber

[warbeak2099]

So inputting around 700 shouldn't starve it or cause it to chuff.

[MonsterMag]

it shouldnt :cheers:

[athomas]

Will a lower input pressure lighten the pull?

No.

The pull force is dictated by the pressure in the front chamber. It only changes when you adjust the velocity (ie chamber pressure). The input pressure does have an effect on the rate of recharge. Therefore, it will have an effect on the return force of the trigger. To keep your recharge rate up and to keep from chuffing, maintain a higher input pressure.

[warbeak2099]

But if you turn down the input pressure, the sear will reset with less force. So the pull should be less stiff. Right?

[athomas]

No.

The diameter of the bottom part of the on-off pin and the chamber pressure applied to it dictates the force of the trigger pull. The diameter of the top part of the on-off pin and the pressure applied to it dictates the return force on the trigger. The ULT has a tiny bottom part of the pin so the force is very small. The top of the pin is larger, so the return force is still high enough to return the sear and trigger. Also, the chamber pressure for a given velocity does not change when you adjust the input pressure. Therefore the force required to pull the trigger also does not change.

[warbeak2099]

Ah, very clear now. Thank you.