Quote Originally Posted by sportbike View Post
Only thing i wasn't impressed with is the gas pressure burst that is still there when starting an arc. I assume it is because of a "not stiff enough" supply hose that turns into a balloon when the solenoid shuts off, causing full pressure at the back side of the valve.
It is the regulators preset pressure for the flow rate but when you shut it off the set pressure will reach it max pressure on the line to the welders shut off valve and yes it will balloon a little but even an none expanding tube it will do the same thing just a little less. If you do not have the pressure up you will not get the flow rate to the torch head. The pressure is set high because they take in consideration that you might have a 25 foot air or water cooled torch. Some regulators have both pressure and flow rate adjustability.